A-LevelChemistryHydrocarbonsOct/Nov 2016Paper 1 Q371 Mark
A species of termite produces a chemical defence secretion which contains the molecule shown. [Figure showing structure of a molecule (alkene with methyl and isopropyl groups, two double bonds)] To help determine the structure of this compound, it is treated with hot, concentrated, acidified manganate(VII) ions. Which compounds are produced in this reaction? 1 CO₂ 2 CH₃COCH₃ 3 CH₃CO₂H
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 B: 1 and 2 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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