A-LevelChemistryCarbonyl compounds9701/12 · Feb/Mar 2021 · Q261 Mark

The diagram shows the formation of compound Y from compound X in a chemical reaction. R₁ and R₂ are alkyl groups. [Figure showing X + HCN (KCN catalyst) -> Y, where Y has an -OH and -CN group on the same carbon, R1 and R2 are alkyl groups branching from that carbon] Which row about this reaction is correct? mechanism compound X A electrophilic addition aldehyde B electrophilic addition ketone C nucleophilic addition ketone D nucleophilic addition aldehyde

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Aelectrophilic addition, aldehyde

Belectrophilic addition, ketone

Cnucleophilic addition, ketone

Dnucleophilic addition, aldehyde

✓ Correct answer

C: nucleophilic addition, ketone

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Topic: Carbonyl compounds, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 26.

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