The formulae of three compounds are shown. C3H7CHO C2H5COCH3 CH2CHCH2CH2OH Only one of these compounds will decolourise bromine water. Only one of these compounds will produce a silver mirror with Tollens' reagent. Which row shows the correct results?
✓ Correct Answer
The correct answer is D: decolourises bromine water: CH2CHCH2CH2OH, forms a silver mirror with Tollens' reagent: C3H7CHO
📋 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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