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href="../19411/nuclear-fusion-nuclear-fission-reactions-1.html">Nuclear fusion & nuclear fission reactions</a></li><li><a href="../19429/solar-energy-1.html">Solar energy</a></li><li><a href="../19437/environmental-impact-global-warming-1.html">Environmental impact - global warming</a></li><li><a href="../19453/electrochemistry-rechargeable-batteries-fuel-cells-1.html">Electrochemistry, rechargeable batteries & fuel cells</a></li><li><a href="../19458/nuclear-fusion-fission-hl--1.html">Nuclear fusion & fission (HL) </a></li><li><a href="../19470/photovoltaic-cells-and-dsscs-1.html">Photovoltaic cells and DSSCs</a></li></ul></li><li class="selected"><a href="../19078/option-d-1.html" class="father">Option D</a><ul class="level-2"><li><a href="../19079/pharmaceutical-products-drug-action--1.html">Pharmaceutical products & drug action </a></li><li><a href="../19158/aspirin-penicillin--1.html">Aspirin & penicillin </a></li><li><a href="../19174/opiates-1.html">Opiates</a></li><li><a href="../19184/ph-regulation-of-the-stomach-1.html">pH regulation of the stomach</a></li><li><a href="../19194/antiviral-medications--1.html">Antiviral medications </a></li><li><a href="../19211/environmental-impact-of-some-medications-1.html">Environmental impact of some medications</a></li><li class="selected"><a href="../19254/taxol-a-chiral-auxiliary-case-study-1.html">Taxol - a chiral auxiliary case study</a></li><li><a href="../19258/nuclear-medicine--1.html">Nuclear medicine </a></li><li><a href="../19273/drug-detection-analysis--1.html">Drug detection & analysis </a></li></ul></li></ul></li><li><a href="../16592/practical-scheme-of-work-ia--1.html">Practical scheme of work & IA </a><ul class="level-1"><li><a href="../16682/internal-assessment-1.html" class="father">Internal Assessment</a><ul class="level-2"><li><a href="../18892/scaffolding-the-investigation-1.html">'Scaffolding' the investigation</a></li><li><a href="../18896/timing-organisation--1.html">Timing & organisation </a></li><li><a href="../18905/choosing-the-research-question-1.html">Choosing the research question</a></li><li><a href="../18946/personal-engagement-1.html">Personal engagement</a></li><li><a href="../18950/exploration-1.html">Exploration</a></li><li><a href="../18957/analysis-1.html">Analysis</a></li><li><a href="../18965/evaluation-1.html">Evaluation</a></li><li><a href="../18966/communication-1.html">Communication</a></li><li><a href="../19882/internal-standardization-of-the-ia-1.html">Internal standardization of the IA</a></li><li><a href="../19901/submitting-the-samples-for-moderation-2.html">Submitting the samples for moderation</a></li><li><a href="../33754/ten-suggestions-for-ias-using-secondary-data-1.html">Ten suggestions for IAs using secondary data</a></li><li><a href="../37544/gaining-full-marks-for-a-databased-ia--1.html">Gaining full marks for a databased IA </a></li><li><a href="../19506/ia-example-marking-exercise--1.html">IA example & marking exercise </a></li><li><a href="../23929/genuine-examples-of-moderated-ia-reports-1.html">Genuine examples of moderated IA reports</a></li><li><a href="../25234/examples-of-teacher-marked-ia-reports--1.html">Examples of teacher-marked IA reports </a></li><li><a href="../37542/history-of-internal-assessment-1.html">History of Internal Assessment</a></li></ul></li><li><a href="../16598/mandatory-laboratory-components-1.html" class="father">Mandatory laboratory components</a><ul class="level-2"><li><a href="../16613/formula-of-magnesium-oxide--1.html">Formula of magnesium oxide </a></li><li><a href="../16612/determining-the-mr-of-an-unknown-gas-1.html">Determining the <i>M</i><sub>r</sub> of an unknown gas</a></li><li><a href="../16615/acid-base-titrations--1.html">Acid-base titrations </a></li><li><a href="../16616/a-green-acid-base-practical-1.html">A green acid-base practical</a></li><li><a href="../16617/analysis-of-aspirin-tablets-1.html">Analysis of aspirin tablets</a></li><li><a href="../16618/caco3-in-egg-shells-1.html">CaCO<sub>3</sub> in egg shells</a></li><li><a href="../16644/enthalpy-changes-1.html">Enthalpy changes</a></li><li><a href="../16631/reaction-rates-1.html">Reaction rates</a></li><li><a href="../16635/rate-dependent-factors-1.html">Rate-dependent factors</a></li><li><a href="../16636/determining-ea-for-a-reaction-1.html">Determining <i>E</i><sub>a</sub> for a reaction</a></li><li><a href="../16637/iodination-of-propanone-1.html">Iodination of propanone</a></li><li><a href="../18144/titrations-with-a-ph-meter-1.html">Titrations with a pH meter</a></li><li><a href="../18355/redox-titration-with-kmno4--1.html">Redox titration with KMnO<sub>4</sub> </a></li><li><a href="../16640/voltaic-cells-1.html">Voltaic cells</a></li><li><a href="../16659/3-d-molecular-modelling--1.html">3-D molecular modelling </a></li></ul></li><li><a href="../17168/other-good-practicals-1.html" class="father">Other good practicals</a><ul class="level-2"><li><a href="../17196/common-chemical-reactions-1.html">Common chemical reactions</a></li><li><a href="../227/elements-oxides-of-the-third-period--1.html">Elements & oxides of the third period </a></li><li><a href="../17239/the-halogens-1.html">The halogens</a></li><li><a href="../17162/boiling-points-of-mixtures-1.html">Boiling points of mixtures</a></li><li><a href="../17170/polarity-of-molecules-1.html">Polarity of molecules</a></li><li><a href="../18083/le-chateliers-principle--1.html">Le Chatelier's principle </a></li><li><a href="../19582/determining-kc-for-an-esterification-reaction-1.html">Determining <i>K</i><sub>c</sub> for an esterification reaction</a></li><li><a href="../18164/redox-reactions-of-vanadium--1.html">Redox reactions of vanadium </a></li><li><a href="../18351/chlorine-in-swimming-pools--1.html">Chlorine in swimming pools </a></li><li><a href="../18178/analysis-of-cuii-ions-in-solution--1.html">Analysis of Cu(II) ions in solution </a></li><li><a href="../18179/percentage-of-copper-in-brass-1.html">Percentage of copper in brass</a></li><li><a href="../18356/electrolytic-cells--1.html">Electrolytic cells </a></li><li><a href="../18598/reactions-of-organic-compounds-1.html">Reactions of organic compounds</a></li><li><a href="../18752/hydrolysis-of-halogenoalkanes-1.html">Hydrolysis of halogenoalkanes</a></li><li><a href="../18784/preparation-of-13-dinitrobenzene--1.html">Preparation of 1,3-dinitrobenzene </a></li><li><a href="../19022/determination-of-an-organic-structure-1.html">Determination of an organic structure</a></li><li><a href="../19887/preparation-of-nylon-66-1.html">Preparation of nylon 6,6</a></li><li><a href="../19343/determination-of-vitamin-c-content--1.html">Determination of vitamin C content </a></li><li><a href="../19342/hydrolysis-of-starch--1.html">Hydrolysis of starch </a></li><li><a href="../19159/preparation-purification-of-aspirin--1.html">Preparation & purification of aspirin </a></li></ul></li><li><a href="../18851/ict-in-practical-work-1.html" class="father">ICT in practical work</a><ul class="level-2"><li><a href="../18852/data-logging--1.html">Data logging </a></li><li><a href="../18853/software-for-graph-plotting--1.html">Software for graph plotting </a></li><li><a href="../18854/spreadsheets-for-data-processing--1.html">Spreadsheets for data processing </a></li><li><a href="../18855/databases-1.html">Databases</a></li><li><a href="../18856/computer-modelling-simulations--1.html">Computer modelling & simulations </a></li></ul></li><li><a href="../16594/group-4-project-1.html" class="father">Group 4 Project</a><ul class="level-2"><li><a href="../16595/practicalities-1.html">Practicalities</a></li><li><a href="../16596/reflective-statement--2.html">Reflective statement </a></li></ul></li><li><a href="../16666/a-new-laboratory-1.html">A new laboratory?</a></li></ul></li><li><a href="../16284/exams-1.html">Exams</a><ul class="level-1"><li><a href="../16286/essential-facts-1.html" class="father">Essential Facts</a><ul class="level-2"><li><a href="../16287/objectives-command-terms-1.html">Objectives & command terms</a></li><li><a href="../16288/grade-descriptors-1.html">Grade descriptors</a></li><li><a href="../16289/grade-boundaries-1.html">Grade boundaries</a></li></ul></li><li><a href="../16302/paper-1-multiple-choice-1.html" class="father">Paper 1 (Multiple Choice)</a><ul class="level-2"><li><a href="../16303/advice-to-students-paper-1-1.html">Advice to students (Paper 1)</a></li><li><a href="../31515/practice-paper-1-exams-1.html">Practice Paper 1 exams</a></li></ul></li><li><a href="../16305/paper-2-1.html" class="father">Paper 2</a><ul class="level-2"><li><a href="../16306/advice-to-students-paper-2-1.html">Advice to students (Paper 2)</a></li><li><a href="../16307/areas-of-difficulty-1.html">Areas of difficulty</a></li></ul></li><li><a href="../16313/paper-3--1.html" class="father">Paper 3 </a><ul class="level-2"><li><a 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href="../16323/retaking-the-exam-1.html">Retaking the exam</a></li></ul></li><li><a href="../16325/faqs-1.html">FAQs</a></li></ul></li><li><a href="../3147/ib-core-1.html">IB Core</a><ul class="level-1"><li><a href="../3149/learner-profile-1.html">Learner Profile</a></li><li><a href="../21735/extended-essays--1.html" class="father">Extended Essays </a><ul class="level-2"><li><a href="../21736/overview--1.html">Overview </a></li><li><a href="../21780/responsibilities-1.html">Responsibilities</a></li><li><a href="../21790/resources-1.html">Resources</a></li><li><a href="../21800/research-1.html">Research</a></li><li><a href="../21804/writing-the-essay-1.html">Writing the essay</a></li><li><a href="../21810/assessment-1.html">Assessment</a></li><li><a href="../22434/summary-of-advice--1.html">Summary of advice </a></li><li><a href="../25272/faqs--1.html">FAQs </a></li></ul></li><li><a href="../307/theory-of-knowledge-tok-1.html" class="father">Theory of Knowledge (TOK)</a><ul class="level-2"><li><a href="../41171/the-12-tok-concepts-1.html">The 12 TOK concepts</a></li><li><a href="../3507/why-tok-chemistry-1.html">Why TOK & Chemistry?</a></li><li><a href="../3505/a-modern-paradigm-1.html">A modern paradigm</a></li></ul></li></ul></li><li><a href="../17783/fast-track-to-tests-questions-1.html">Fast track to tests & questions</a><ul class="level-1"><li><a href="../17784/sl-multiple-choice-tests-on-individual-topics-1.html">SL Multiple choice tests on individual topics</a></li><li><a href="../24351/sl-multiple-choice-quizzes-on-sub-topics-1.html">SL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31519/sl-practice-paper-1-exams-1.html">SL Practice Paper 1 exams</a></li><li><a href="../17786/sl-questions-on-each-sub-topic-1.html">SL Questions on each sub-topic</a></li><li><a href="../20431/sl-paper-3-section-a-questions-1.html">SL Paper 3 Section A questions</a></li><li><a href="../17792/sl-questions-on-the-options-1.html">SL Questions on the options</a></li><li><a href="../24897/sl-quizzes-on-option-sub-topics--1.html">SL Quizzes on option sub-topics </a></li><li><a href="../17785/hl-multiple-choice-tests-on-individual-topics-1.html">HL Multiple choice tests on individual topics</a></li><li><a href="../24352/hl-multiple-choice-quizzes-on-sub-topics-1.html">HL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31520/hl-practice-paper-1-exams--1.html">HL Practice Paper 1 exams </a></li><li><a href="../17787/hl-questions-on-each-sub-topic--1.html">HL Questions on each sub-topic </a></li><li><a href="../20428/hl-paper-3-section-a-questions-1.html">HL Paper 3 Section A questions</a></li><li><a href="../17793/hl-questions-on-the-options-1.html">HL Questions on the options</a></li><li><a href="../24973/hl-quizzes-on-option-sub-topics-1.html">HL Quizzes on option sub-topics</a></li><li><a href="../41573/printable-versions-of-written-tasks--1.html">Printable versions of written tasks </a></li></ul></li><li><a 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introduction questions ">Materials science introduction questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26082/mc-test-introduction-to-materials-science-1.html" title="MC test: Introduction to materials science">MC test: Introduction to materials science</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26051/materials-science-introduction-answers--1.html" title="Materials science introduction answers ">Materials science introduction answers </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19519/metals-and-icp-spectroscopy-1.html" title="Metals and ICP spectroscopy">Metals and ICP spectroscopy</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26109/mc-test-metals-icp-spectroscopy-1.html" title="MC test: Metals & ICP spectroscopy">MC test: Metals & ICP spectroscopy</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19540/metals-icp-spectroscopy-questions-1.html" title="Metals & ICP spectroscopy questions">Metals & ICP spectroscopy questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26052/metals-icp-spectroscopy-answers-1.html" title="Metals & ICP spectroscopy answers">Metals & ICP spectroscopy answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19541/catalysts--1.html" title="Catalysts ">Catalysts </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26518/mc-test-catalysts-1.html" title="MC test: Catalysts">MC test: Catalysts</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19549/catalysts-questions--1.html" title="Catalysts questions ">Catalysts questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26053/catalysts-answers--1.html" title="Catalysts answers ">Catalysts answers </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19580/liquid-crystals-1.html" title="Liquid crystals">Liquid crystals</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26133/mc-test-liquid-crystals-1.html" title="MC test: Liquid crystals">MC test: Liquid crystals</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19592/liquid-crystals-questions--1.html" title="Liquid crystals questions ">Liquid crystals questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26054/liquid-crystals-answers-1.html" title="Liquid crystals answers">Liquid crystals answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19665/polymers--1.html" title="Polymers ">Polymers </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26130/mc-test-polymers-1.html" title="MC test: Polymers">MC test: Polymers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19667/polymers-questions--1.html" title="Polymers questions ">Polymers questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26055/polymers-answers--1.html" title="Polymers answers ">Polymers answers </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19672/nanotechnology-1.html" title="Nanotechnology">Nanotechnology</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26759/mc-test-nanotechnology-1.html" title="MC test: Nanotechnology">MC test: Nanotechnology</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19778/nanotechnology-questions--1.html" title="Nanotechnology questions ">Nanotechnology questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26056/nanotechnology-answers--1.html" title="Nanotechnology answers ">Nanotechnology answers </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19843/environmental-impact-plastics-1.html" title="Environmental impact - plastics">Environmental impact - plastics</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26857/mc-test-environmental-impact-plastics-1.html" title="MC test: Environmental impact - plastics">MC test: Environmental impact - plastics</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19847/environmental-impact-plastics-questions-1.html" title="Environmental impact - plastics questions">Environmental impact - plastics questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26057/environmental-impact-plastics-answers-1.html" title="Environmental impact - plastics answers">Environmental impact - plastics answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19858/superconducting-metals-x-ray-crystallography--1.html" title="Superconducting metals & X-ray crystallography ">Superconducting metals & X-ray crystallography </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26975/mc-test-superconducting-metals-x-ray-crystallography-1.html" title="MC test: Superconducting metals & X-ray crystallography">MC test: Superconducting metals & X-ray crystallography</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19860/superconducting-metals-x-ray-crystallography-questions--1.html" title="Superconducting metals & X-ray crystallography questions ">Superconducting metals & X-ray crystallography questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26058/superconducting-metals-x-ray-crystallography-answers-1.html" title="Superconducting metals & X-ray crystallography answers">Superconducting metals & X-ray crystallography answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19666/condensation-polymers-1.html" title="Condensation polymers">Condensation polymers</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27130/mc-test-condensation-polymers-1.html" title="MC test: Condensation polymers">MC test: Condensation polymers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19910/condensation-polymers-questions--1.html" title="Condensation polymers questions ">Condensation polymers questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26059/condensation-polymers-answers-1.html" title="Condensation polymers answers">Condensation polymers answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19916/environmental-impact-heavy-metals-1.html" title="Environmental impact - heavy metals">Environmental impact - heavy metals</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../27097/mc-test-environmental-impact-heavy-metals-1.html" title="MC test: Environmental impact - heavy metals">MC test: Environmental impact - heavy metals</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19926/environmental-impact-heavy-metals-questions--1.html" title="Environmental impact - heavy metals questions ">Environmental impact - heavy metals questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../26060/environmental-impact-heavy-metals-answers-1.html" title="Environmental impact - heavy metals answers">Environmental impact - heavy metals answers</a></li></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../19284/option-b--1.html" title="Option B ">Option B </a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19290/introduction-to-biochemistry--1.html" title="Introduction to biochemistry ">Introduction to biochemistry </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24828/mc-test-introduction-to-biochemistry-1.html" title="MC test: Introduction to biochemistry">MC test: Introduction to biochemistry</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19286/introduction-to-biochemistry-questions--1.html" title="Introduction to biochemistry questions ">Introduction to biochemistry questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24860/introduction-to-biochemistry-answers-1.html" title="Introduction to biochemistry answers">Introduction to biochemistry answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19287/proteins-enzymes--1.html" title="Proteins & enzymes ">Proteins & enzymes </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24830/mc-test-proteins-enzymes-1.html" title="MC test: Proteins & enzymes">MC test: Proteins & enzymes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19289/proteins-enzymes-questions--1.html" title="Proteins & enzymes questions ">Proteins & enzymes questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24862/proteins-enzymes-answers-1.html" title="Proteins & enzymes answers">Proteins & enzymes answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19291/lipids-1.html" title="Lipids">Lipids</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24834/mc-test-lipids-1.html" title="MC test: Lipids">MC test: Lipids</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19292/lipids-questions--1.html" title="Lipids questions ">Lipids questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24863/lipids-answers-1.html" title="Lipids answers">Lipids answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19299/carbohydrates--1.html" title="Carbohydrates ">Carbohydrates </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24851/mc-test-carbohydrates-1.html" title="MC test: Carbohydrates">MC test: Carbohydrates</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19298/carbohydrate-questions--1.html" title="Carbohydrate questions ">Carbohydrate questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24864/carbohydrate-answers-1.html" title="Carbohydrate answers">Carbohydrate answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19305/vitamins--1.html" title="Vitamins ">Vitamins </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24829/mc-test-vitamins-1.html" title="MC test: Vitamins">MC test: Vitamins</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19410/vitamins-questions--1.html" title="Vitamins questions ">Vitamins questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24865/vitamins-answers-1.html" title="Vitamins answers">Vitamins answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19313/biochemistry-the-environment--1.html" title="Biochemistry & the environment ">Biochemistry & the environment </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24946/mc-test-biochemistry-the-environment-1.html" title="MC test: Biochemistry & the environment">MC test: Biochemistry & the environment</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19335/biochemistry-the-environment-questions-1.html" title="Biochemistry & the environment questions">Biochemistry & the environment questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24866/biochemistry-the-environment-answers-1.html" title="Biochemistry & the environment answers">Biochemistry & the environment answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19336/proteins-enzymes-ahl--1.html" title="Proteins & enzymes (AHL) ">Proteins & enzymes (AHL) </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24962/mc-test-proteins-enzymes-ahl-1.html" title="MC test: Proteins & enzymes (AHL)">MC test: Proteins & enzymes (AHL)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19341/proteins-enzymes-hl-questions--1.html" title="Proteins & enzymes (HL) questions ">Proteins & enzymes (HL) questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24867/proteins-enzymes-hl-answers-1.html" title="Proteins & enzymes (HL) answers">Proteins & enzymes (HL) answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19347/nucleic-acids--1.html" title="Nucleic acids ">Nucleic acids </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24993/mc-test-nucleic-acids-1.html" title="MC test: Nucleic acids">MC test: Nucleic acids</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19360/nucleic-acids-questions--1.html" title="Nucleic acids questions ">Nucleic acids questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24869/nucleic-acids-answers-1.html" title="Nucleic acids answers">Nucleic acids answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19361/biological-pigments--1.html" title="Biological pigments ">Biological pigments </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25033/mc-test-biological-pigments-1.html" title="MC test: Biological pigments">MC test: Biological pigments</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19365/biological-pigments-questions--1.html" title="Biological pigments questions ">Biological pigments questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24870/biological-pigments-answers-1.html" title="Biological pigments answers">Biological pigments answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19366/stereochemistry-in-biomolecules-1.html" title="Stereochemistry in biomolecules">Stereochemistry in biomolecules</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25034/mc-test-stereochemistry-in-biomolecules--1.html" title="MC test: Stereochemistry in biomolecules ">MC test: Stereochemistry in biomolecules </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19373/stereochemistry-in-biomolecules-questions-1.html" title="Stereochemistry in biomolecules questions">Stereochemistry in biomolecules questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../24871/stereochemistry-in-biomolecules-answers--1.html" title="Stereochemistry in biomolecules answers ">Stereochemistry in biomolecules answers </a></li></ul></ul><li class=" parent" style="padding-left: 0px"><i class="expander fa fa-caret-right "></i><a href="../19390/option-c--1.html" title="Option C ">Option C </a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19391/energy-sources-1.html" title="Energy sources">Energy sources</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25112/mc-test-energy-sources-1.html" title="MC test: Energy sources">MC test: Energy sources</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19404/energy-sources-questions--1.html" title="Energy sources questions ">Energy sources questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25025/energy-sources-answers-1.html" title="Energy sources answers">Energy sources answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19407/fossil-fuels-1.html" title="Fossil fuels">Fossil fuels</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25178/mc-test-fossil-fuels-1.html" title="MC test: Fossil fuels">MC test: Fossil fuels</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19312/fossil-fuels-questions--1.html" title="Fossil fuels questions ">Fossil fuels questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25123/fossil-fuels-answers--1.html" title="Fossil fuels answers ">Fossil fuels answers </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19411/nuclear-fusion-nuclear-fission-reactions-1.html" title="Nuclear fusion & nuclear fission reactions">Nuclear fusion & nuclear fission reactions</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25188/mc-test-nuclear-fusion-nuclear-fission-reactions-1.html" title="MC test: Nuclear fusion & nuclear fission reactions">MC test: Nuclear fusion & nuclear fission reactions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19421/nuclear-fusion-nuclear-fission-questions-1.html" title="Nuclear fusion & nuclear fission questions">Nuclear fusion & nuclear fission questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25180/nuclear-fusion-nuclear-fission-answers-1.html" title="Nuclear fusion & nuclear fission answers">Nuclear fusion & nuclear fission answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19429/solar-energy-1.html" title="Solar energy">Solar energy</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25207/mc-test-solar-energy-1.html" title="MC test: Solar energy">MC test: Solar energy</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19430/solar-energy-questions-1.html" title="Solar energy questions">Solar energy questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25189/solar-energy-answers-1.html" title="Solar energy answers">Solar energy answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19437/environmental-impact-global-warming-1.html" title="Environmental impact - global warming">Environmental impact - global warming</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25236/mc-test-environmental-impact-global-warming-1.html" title="MC test: Environmental impact – global warming">MC test: Environmental impact – global warming</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19450/environmental-impact-global-warming-questions--1.html" title="Environmental impact - global warming questions ">Environmental impact - global warming questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25190/environmental-impact-global-warming-answers-1.html" title="Environmental impact - global warming answers">Environmental impact - global warming answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19453/electrochemistry-rechargeable-batteries-fuel-cells-1.html" title="Electrochemistry, rechargeable batteries & fuel cells">Electrochemistry, rechargeable batteries & fuel cells</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25258/mc-test-electrochemistry-rechargeable-batteries-fuel-cells-1.html" title="MC test: Electrochemistry, rechargeable batteries & fuel cells">MC test: Electrochemistry, rechargeable batteries & fuel cells</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19455/electrochemistry-rechargeable-batteries-fuel-cells-questions-1.html" title="Electrochemistry, rechargeable batteries & fuel cells questions">Electrochemistry, rechargeable batteries & fuel cells questions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25204/electrochemistry-rechargeable-batteries-fuel-cells-answers-1.html" title="Electrochemistry, rechargeable batteries & fuel cells answers">Electrochemistry, rechargeable batteries & fuel cells answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19458/nuclear-fusion-fission-hl--1.html" title="Nuclear fusion & fission (HL) ">Nuclear fusion & fission (HL) </a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25269/mc-test-nuclear-fusion-nuclear-fission-hl-1.html" title="MC test: Nuclear fusion & nuclear fission (HL)">MC test: Nuclear fusion & nuclear fission (HL)</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../19468/nuclear-fusion-fission-reactions-hl-questions--1.html" title="Nuclear fusion & fission reactions (HL) questions ">Nuclear fusion & fission reactions (HL) questions </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25205/nuclear-fusion-fission-reactions-hl-answers-1.html" title="Nuclear fusion & fission reactions (HL) answers">Nuclear fusion & fission reactions (HL) answers</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a href="../19470/photovoltaic-cells-and-dsscs-1.html" title="Photovoltaic cells and DSSCs">Photovoltaic cells and DSSCs</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a href="../25302/mc-test-photovoltaic-cells-dsscs-1.html" title="MC test: Photovoltaic 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</div><section id="main-content"><h1><img alt="" height="22" src="../../../img/tib-icons/higher-level-32-1.png" title="" width="22"> Multiple choice test on D.7 Taxol - a chiral auxiliary case study</h1><hr class="hidden"><p>Use the following 'quiz' to test your knowledge and understanding of this sub-topic. As this relates to a sub-topic on the options you may need access to the IB data booklet.</p><p>If you get an answer wrong, read through the explanation carefully to learn from your mistakes.</p><hr class="hidden"><div class="tib-quiz" data-quiz-id="424" data-structure="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" data-score-answers="6d4a526a457a48584f763758344a7649472f76324c53614b78524c393439595570496d5a5971374b38686f3d"><div class="exercise">
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<p>Which method can be used to separate a racemic mixture of two enantiomers into its individual components?</p>
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<p><label class="radio" data-answer="279e2fdbd545cb79714dcae6928149a6"><input type="radio"><span> distillation</span></label></p>
<p><label class="radio" data-answer="de9542c17862fec51423b43dd47a7b00"><input type="radio"><span> chromatography </span></label></p>
<p><label class="radio" data-answer="a3558dc693b86f9c8e16dfafb4c3b296"><input type="radio"><span> centrifugation</span></label><br>
<br>
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<p><label class="radio" data-answer="61a85397f062e8574bbc04ad5f65657d"><input type="radio"><span> fractional distillation</span></label></p>
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<div class="q-explanation">
<p>In chiral column chromatography, silica gel is bonded to chiral molecules (usually chiral sugars) to form the chiral stationary phase. The enantiomers will then separate as they run down the column because one of the enantiomers will interact more strongly with the column and be eluted more slowly.</p>
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<p>Where does the drug paclitaxel (taxol) occur naturally?</p>
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<p><label class="radio" data-answer="beccb0927ce75cecce19092da18dac7e"><input type="radio"><span> Scots pine tree</span></label></p>
<p><label class="radio" data-answer="72e8cbec565e792c1ec9aba97644412d"><input type="radio"><span> English oak tree</span></label></p>
<p><label class="radio" data-answer="f939394782750f9cb7dc4173c12c4309"><input type="radio"><span> Californian redwood tree</span></label></p>
<p><label class="radio" data-answer="ca6ca61187c908e2214c0bf647a8cffa"><input type="radio"><span> The Pacific yew tree</span></label></p>
</div>
<div class="q-explanation">
<p>Paclitaxel is found in the bark of the Pacific yew tree (<em>Taxus brevifolia</em>).</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which type of disease is paclitaxel (taxol) used to treat?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="b7983110bbe8c462e30d9a78a66d1fe9"><input type="radio"><span> bacterial infections</span></label></p>
<p><label class="radio" data-answer="c2958a8530426aa2981426bcc63e63ab"><input type="radio"><span> viral infections</span></label></p>
<p><label class="radio" data-answer="451b39dcc9eb6e7542b49f597323a01a"><input type="radio"><span> fungal infections</span></label></p>
<p><label class="radio" data-answer="a99dca5593185c498b63a5eed917bd4f"><input type="radio"><span> cancer</span></label></p>
</div>
<div class="q-explanation">
<p>Paclitaxel is used to treat several different types of cancer including ovarian cancer, breast cancer, lung cancer, cervical cancer, and pancreatic cancer.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Beccatin III is a natural product that can be used as a precursor in the semi-synthesis of paclitaxel (taxol).</p>
<p><img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/option-d/baccatin-iii-(1).png" style="width: 220px; height: 194px;"></p>
<p>How many chiral centres does beccatin III posses?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="d3d9446802a44259755d38e6d163e820"><input type="radio"><span> 10</span></label></p>
<p><label class="radio" data-answer="45c48cce2e2d7fbdea1afc51c7c6ad26"><input type="radio"><span> 9</span></label></p>
<p><label class="radio" data-answer="c9f0f895fb98ab9159f51fd0297e236d"><input type="radio"><span> 8</span></label></p>
<p><label class="radio" data-answer="6512bd43d9caa6e02c990b0a82652dca"><input type="radio"><span> 11</span></label></p>
</div>
<div class="q-explanation">
<p>The full wedges and/or the dotted-line wedges show the positions of the 9 chiral carbon atoms. Each chiral carbon atom contains four different groups attached to it.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which property can be used to distinguish between different enantiomers of paclitaxel (taxol)?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="296cc9a02b167493f6ff885c48ca71ff"><input type="radio"><span> colour</span></label></p>
<p><label class="radio" data-answer="3ede9bea1b247b14e64bee16162b547d"><input type="radio"><span> ability to rotate the plane of plane-polarised light </span></label></p>
<p><label class="radio" data-answer="653fa5e1b6dc2bab54d338d97016363d"><input type="radio"><span> melting point</span></label></p>
<p><label class="radio" data-answer="35f3675343000d6bb5f10ce451a571a4"><input type="radio"><span> density</span></label></p>
</div>
<div class="q-explanation">
<p>Enantiomers have identical physical properties except for the direction and amount that they rotate the plane of plane-polarised light.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which properties must be possessed by a chiral auxiliary?</p>
<p><strong>I.</strong> It must be optically active.</p>
<p><strong>II.</strong> It should be easy to remove after the desired intermediate has been formed.</p>
<p><strong>III.</strong> It should be able to bond covalently to the non-chiral substrate.</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="e6419af0165dac3130ce54bcb3f615f5"><input type="radio"><span> <strong>I, II</strong> and <strong>III </strong></span></label></p>
<p><label class="radio" data-answer="f66d74473eaa9d67d77a484a14d7ffce"><input type="radio"><span> <strong>I</strong> and <strong>II </strong>only</span></label></p>
<p><label class="radio" data-answer="fb11b627e4760b5e2524a7af2daae6e8"><input type="radio"><span> <strong>I</strong> and <strong>III </strong>only</span></label></p>
<p><label class="radio" data-answer="6e8f59490da4f8511cc6c35874c9aea1"><input type="radio"><span> <strong>II</strong> and <strong>III </strong>only</span></label></p>
</div>
<div class="q-explanation">
<p>Chiral auxiliaries must be able to bond to the starting material (substrate) and be easy to remove in order to complete the synthesis of the desired enantiomer. In order for the desired enantiomer to be formed the chiral auxiliary must be chiral.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Which instrument can be used to differentiate between different enantiomers of Beccatin III, a natural product that can be used as a precursor in the semi-synthesis of paclitaxel (taxol)?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="7dadcbb5ad609ee82d849e97b8b32783"><input type="radio"><span> infrared spectrometer</span></label></p>
<p><label class="radio" data-answer="6246f4bedd6d38015f78ae8f372f58d9"><input type="radio"><span> mass spectrometer</span></label></p>
<p><label class="radio" data-answer="0cff1705d3e823fa26ba8ea46fd04918"><input type="radio"><span> polarimeter</span></label></p>
<p><label class="radio" data-answer="997c79d3d4eaab81c1543945869c062e"><input type="radio"><span> <sup>1</sup>H NMR spectrometer</span></label></p>
</div>
<div class="q-explanation">
<p>Because they contain the same molar mass, the same functional groups and the same structural formulas the different enantiomers will have identical spectra (or virtually identical spectra even at high resolution) but a polarimeter will detect how much and in what direction the different enantiomers will rotate the plane of plane-polarised light.</p>
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<p> </p>
<div class="exercise">
<div class="q-question">
<p>Compound <strong>X</strong> exists as two enantiomers, <strong>A</strong> and <strong>B</strong>. A pure sample of enantiomer <strong>A</strong> rotates the plane of plane-polarised light clockwise by 13<sup>o</sup> and has a melting point if 131 <sup>o</sup>C. After a sample of compound <strong>X</strong> had been prepared in the laboratory it was found to melt at 131 <sup>o</sup>C and rotate the plane of plane-polarised light anticlockwise by 11<sup>o</sup>. What can be deduced from this observation?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="260c533718e5d182240ec2d7fb1c9bb9"><input type="radio"><span> The laboratory sample is impure <strong>X</strong>.</span></label></p>
<p><label class="radio" data-answer="0d9a48e5370bb952e754b0f31e521598"><input type="radio"><span> The laboratory sample is pure <strong>X</strong> and contains mainly enantiomer <strong>A</strong> with some enantiomer <strong>B</strong>.</span></label></p>
<p><label class="radio" data-answer="2dc99d4e99698a45e9ec2adc4cd22254"><input type="radio"><span> The laboratory sample is pure <strong>X</strong> and contains mainly enantiomer <strong>B</strong> with some enantiomer <strong>A</strong>. </span></label></p>
<p><label class="radio" data-answer="578734ae5f8031cd51940151d8a9494f"><input type="radio"><span> The laboratory sample is pure <strong>X</strong> and contains only enantiomer <strong>A</strong>. </span></label></p>
</div>
<div class="q-explanation">
<p>Because there is no lowering of melting point the sample must be pure <strong>X</strong>. Pure <strong>B</strong> will rotate the plane of plane-polarised light <strong>anti</strong>clockwise by 13<sup>o</sup> so the sample must be a mixture consisting mainly of enantiomer <strong>B</strong> with some enantiomer <strong>A</strong> present.</p>
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<div class="exercise">
<div class="q-question">
<p>Specific stereoisomers of 2-phenylcyclohexanol are used as chiral auxiliaries in the synthesis of paclitaxel (taxol). The structures of the four possible stereoisomers of 2-phenylcyclohexanol are shown and labelled, <strong>A</strong>, <strong>B</strong>, <strong>C</strong> and <strong>D</strong>.</p>
<p><img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/option-d/isomers-of-2-phenylcyclohexanol.png" style="width: 420px; height: 114px;"></p>
<p>Which is a true statement?</p>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="9fdb45ed2998c5219f9bb03fb6a90dcd"><input type="radio"><span> <strong>B</strong> and <strong>C</strong> are both enantiomers of trans-2-phenylcyclohexanol.</span></label></p>
<p><label class="radio" data-answer="65171835f0a59e1c82e5bd0e698e67ce"><input type="radio"><span> <strong>A</strong> and <strong>C</strong> are both enantiomers of <em>cis</em>-2-phenylcyclohexanol.</span></label></p>
<p><label class="radio" data-answer="b44d14db4b48329142dbafb6a172e101"><input type="radio"><span> <strong>A</strong> and <strong>B</strong> are both enantiomers of trans-2-phenylcyclohexanol.</span></label></p>
<p><label class="radio" data-answer="f098e94fced37595c59586aead7a884e"><input type="radio"><span> <strong>C</strong> and <strong>D</strong> are both enantiomers of <em>cis</em>-2-phenylcyclohexanol.</span></label></p>
</div>
<div class="q-explanation">
<p><strong>A</strong> and <strong>D</strong> are both <em>cis</em>-2-phenylcyclohexanol whereas <strong>B</strong> and <strong>C</strong> are both <em>trans</em>-2-phenylcylcohexanol.</p>
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<div class="exercise">
<div class="q-question">
<p>In the presence of a chiral auxiliary (CA), non-chiral starting material S reacts with a reagent R to form the product S−R. The process goes through two intermediates and the chiral auxiliary is recycled once it has been removed.</p>
<p><img alt="" class="noborder" src="../../../ib/chemistry/images/quiz/option-d/chiral-auxiiary-pathway.png" style="width: 400px; height: 151px;"></p>
<p>Which row describes the the two intermediates and the product correctly?</p>
<table border="0" cellpadding="5" cellspacing="5" height="166" width="627">
<tbody>
<tr>
<td> </td>
<td><strong>1<sup>st.</sup> intermediate</strong></td>
<td><strong>2<sup>nd. </sup>intermediate</strong></td>
<td><strong>Product</strong></td>
</tr>
<tr>
<td><strong>1</strong></td>
<td>single enantiomer</td>
<td>single enantiomer</td>
<td>diastereomer</td>
</tr>
<tr>
<td><strong>2</strong></td>
<td>diastereomer</td>
<td>single enantiomer</td>
<td>single enantiomer</td>
</tr>
<tr>
<td><strong>3</strong></td>
<td>diastereomer</td>
<td>diastereomer</td>
<td>single enantiomer</td>
</tr>
<tr>
<td><strong>4</strong></td>
<td>single enantiomer</td>
<td>diastereomer</td>
<td>single enantiomer</td>
</tr>
</tbody>
</table>
</div>
<div class="q-answer">
<p><label class="radio" data-answer="c4ca4238a0b923820dcc509a6f75849b"><input type="radio"><span> <strong>1</strong></span></label></p>
<p><label class="radio" data-answer="a87ff679a2f3e71d9181a67b7542122c"><input type="radio"><span> <strong>4</strong></span></label></p>
<p><label class="radio" data-answer="c81e728d9d4c2f636f067f89cc14862c"><input type="radio"><span> <strong>2</strong></span></label></p>
<p><label class="radio" data-answer="eccbc87e4b5ce2fe28308fd9f2a7baf3"><input type="radio"><span> <strong>3</strong></span></label></p>
</div>
<div class="q-explanation">
<p>The starting material reacts with the chiral auxiliary to give an optically active intermediate. When this intermediate reacts with the chiral reactant the configuration of the second intermediate is affected by the configuration of the existing chiral centre and a diastereomer is formed. The chiral auxiliary is then removed leaving the product with the desired stereochemistry.</p>
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var hTopmenu = $('#topmenu').height();
var n = 0;
$('nav.top-nav > ul > li').each(function(k, e) {
if (n > 1) {
var diff = hTopmenu-(e.offsetTop+e.offsetHeight);
$(e).find(' > ul ').css('margin-top', '-'+diff+'px');
}
n++;
});
});
</script>
</body>
</html>