NEET 2012 Chemistry question

Consider the reaction:

RCHO + NH_2NH_2 → RCH = N - NH_2

What sort of reaction is it?

(1)Nucleophilic addition - elimination reactionCorrect
(2)Electrophilic addition - elimination reaction
(3)Free radical addition - elimination reaction
(4)Electrophilic substitution elimination reaction

Answer: (1)

Solution

The nitrogen of hydrazine has a lone pair and acts as a nucleophile; it attacks the electrophilic carbonyl carbon of the aldehyde (nucleophilic addition) to give a carbinolamine-type intermediate, . This then loses a

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Question ID VK-090981