A-LevelChemistryOrganic synthesisOct/Nov 2019Paper 1 Q401 Mark
Each of the compounds below is treated separately with an excess of NaBH₄. The product of each reaction is then heated with an excess of concentrated H₂SO₄. Which compounds give only one final product with the molecular formula C₇H₁₀? 1 [Skeletal structure of 3-methylcyclohexanone] 2 [Skeletal structure of 2,6-dimethylcyclohexanone] 3 [Skeletal structure of 4-methylcyclohexanone]
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is C: 2 and 3 only are correct
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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