A-LevelChemistryIntroduction to organic chemistryFeb/Mar 2021Paper 1 Q201 Mark
The structures of citric acid and isocitric acid are shown. [Figure showing structures of citric acid and isocitric acid] How many chiral centres does each acid possess? citric acid isocitric acid A 1 1 B 1 2 C 0 1 D 0 2
Acitric acid 1, isocitric acid 1
Bcitric acid 1, isocitric acid 2
Ccitric acid 0, isocitric acid 1
Dcitric acid 0, isocitric acid 2
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of introduction to organic chemistry 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...
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