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Q.

Consider the reaction RCHO+NH2NH2RCH=NNH2 What sort of reaction is it?

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a

Electrophilic addition - elimination reaction

b

Electrophilic substitution - elimination reaction

c

Free radical addition - elimination reaction

d

Nucleophilic addition - elimination reaction

answer is D.

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Detailed Solution

The reaction RCHO + NH2​NH2 ​→ RCH=N−NH2​ is a nucleophilic addition-elimination
reaction. First, a molecule of hydrazine is added to the carbonyl group. This is a nucleophilic addition reaction.
RCHO + NH2​NH2 ​→ RCH(OH)−NH−NH2
Then, a molecule of water is eliminated. This is an elimination reaction.
RCH(OH)−NH−NH2 ​→ RCH=N−NH2 ​+ H2​O

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