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During reduction of aldehydes with hydrazine and potassium hydroxide, the first is the formation of:

1. (a) R—CH=N—NH2
2. (b) R—C≡N
3. (c) R—C—NH2 || O
4. (d) R—CH=NH

Correct answer: (a) R—CH=N—NH2

Solution

The reduction of aldehydes with hydrazine and potassium hydroxide (Wolff-Kishner reduction) initially forms a hydrazone, which has the structure R—CH=N—NH2.

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