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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: CH3NO2

Solution

Compound [A] is CH3NO2 because it can be reduced to form CH3CH2NH2 (compound [B]), which upon treatment with HNO2 will yield ethanol (CH3CH2OH). This sequence of transformations aligns with the properties of nitro compounds undergoing reduction and subsequent diazotization.

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