A-LevelChemistryHydroxy compoundsOct/Nov 2017Paper 2 Q423 Marks
Some reactions are shown, based on methylpropan-2-ol, (CH3)3COH. [Figure showing reaction scheme: (CH3)3CBr (reaction 1) → (CH3)3COH (reaction 2) → (CH3)2C=CH2 (reaction 3) → (CH3)3CBr and (CH3)2CHCH2Br (reaction 4)] 1-bromobutane is a structural isomer of the product of reaction 1. The product of reaction 3, methylpropene, does not show stereoisomerism.
📋 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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