A-LevelChemistryCarbonyl compounds9701/12 · May/June 2011 · Q391 Mark

In the reaction between an aldehyde and HCN, catalysed by NaCN, which statements about the reaction mechanism are correct? 1 A new carbon-carbon bond is formed. 2 In the intermediate, the oxygen carries a negative charge. 3 The last stage involves the formation of a hydrogen-oxygen bond.

A1, 2 and 3 are correct

B1 and 2 only are correct

C2 and 3 only are correct

D1 only is correct

✓ Correct answer

A: 1, 2 and 3 are correct

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Topic: Carbonyl compounds, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2011 Paper 1 Variant 2, question 39.

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