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In the reaction sequence below, identify compound [A]: [A] —(reduction)→ [B] —(HNO2)→ CH3CH2OH

1. CH3CH2CN
2. CH3NO2
3. CH3NC
4. CH3CN

Correct answer: CH3CN

Solution

HNO2 converts a primary amine to an alcohol, so [B] must be ethylamine (CH3CH2NH2), giving CH3CH2OH. Ethylamine is obtained by reduction of acetonitrile CH3CN, so [A] = CH3CN.

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