The product of the reaction between $R C H O$ and $N H_{2} N H_{2}$ is

R C H = N N H_{2}

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R C H = N H

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R C H_{2} N H_{2}

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R C O N_{3}

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Solution

The correct option is A
$R C H = N N H_{2}$
It is a simple condensation reaction which proceeds with elimination of water.
Aldehyde $R C H O$ reacts with hydrazine $N H_{2} N H_{2}$ to form hydrazone $R C H = N N H_{2} .$
Hence, the correct answer is option (a).

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R C H O + N H_{2} N H_{2} \to R C H = N N H_{2}

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