A-LevelChemistryOrganic synthesisMay/June 2011Paper 1 Q291 Mark
This question should be answered by considering the reactions of KMnO4 with different functional groups under the stated conditions. The diagram shows the structure of the naturally-occurring molecule cholesterol. [Figure 29.1] Cholesterol is separately treated with • cold, dilute acidified KMnO4, • hot, concentrated acidified KMnO4. What is the change in the number of chiral carbon atoms in the molecule during each reaction?
Acold, dilute acidified KMnO4: +1, hot, concentrated acidified KMnO4: 0
Bcold, dilute acidified KMnO4: +1, hot, concentrated acidified KMnO4: -1
Ccold, dilute acidified KMnO4: +2, hot, concentrated acidified KMnO4: 0
Dcold, dilute acidified KMnO4: +2, hot, concentrated acidified KMnO4: -1
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of organic synthesis within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep