A-LevelChemistryCarbonyl compoundsOct/Nov 2009Paper 1 Q271 Mark

Cyanohydrins can be made from carbonyl compounds by generating CN⁻ ions from HCN in the presence of a weak base. [Figure 27.1] In a similar reaction, ⁻CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an aldehyde and CH3CO2CH3 in the presence of a strong base?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: CH3CH2CH(OH)CH2CO2CH3.

Q: What topic does this question test?

This question tests Carbonyl compounds in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

ACH3CH(OH)CO2CH3

BCH3CO2CH2CH(OH)CH3

CCH3CH2CH(OH)CH2CO2CH3

D(CH3)2C(OH)CH2CO2CH3

✓ Correct Answer

The correct answer is C: CH3CH2CH(OH)CH2CO2CH3

📋 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 multiple-choice question tests Carbonyl compounds in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2009 examination, Paper 1 Variant 2.

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