A-LevelChemistryCarboxylic acids and derivativesMay/June 2016Paper 1 Q301 Mark
Compound X, C₄H₈O₂, has an unbranched carbon chain. An aqueous solution of X has an approximate pH of 3. Compound Y, C₃H₈O, is a secondary alcohol. X and Y are reacted together in the presence of a little concentrated sulfuric acid to form Z as the major organic product. What is the structural formula of Z?
A(CH₃)₂CHCO₂CH₂CH₂CH₃
BCH₃(CH₂)₂CO₂CH(CH₃)₂
CCH₃(CH₂)₂CO₂(CH₂)₂CH₃
D(CH₃)₂CHCO₂CH(CH₃)₂
✓ Correct Answer
The correct answer is B: CH₃(CH₂)₂CO₂CH(CH₃)₂
📋 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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