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A-LevelChemistryCarbonyl compoundsOct/Nov 2025Paper 4 Q711 Marks

P, Q, R, S, T, U, and V are the seven structural isomers with molecular formula C5H10O that have a carbonyl group. P CH3(CH2)3CHO S (CH3)3CCHO V (CH3)2CHCOCH3 Q CH3CH2CH(CH3)CHO T CH3CH2CH2COCH3 R (CH3)2CHCH2CHO U CH3CH2COCH2CH3

Q: What topic does this question test?

This question tests Carbonyl compounds in A-Level Chemistry (syllabus code 9701). It is worth 11 marks.

📋 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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About This A-Level Chemistry Question

Topic

This structured question tests Carbonyl compounds in A-Level Chemistry (syllabus code 9701). It is worth 11 marks.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2025 examination, Paper 4 Variant 2.

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