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NEET CHEMISTRYAldehydes, Ketones and Carboxylic AcidsMedium

Question

Consider the reaction: RCHO+NH2NH2→RCH=N−NH2RCHO + NH_2NH_2 \rightarrow RCH=N-NH_2 What sort of reaction is it?

A

Free radical addition – elimination reaction

B

Electrophilic substitution-elimination reaction

C

Nucleophilic addition – elimination reaction

D

Electrophilic addition – elimination reaction

Step-by-Step Solution

The reaction between an aldehyde (RCHORCHO) and hydrazine (NH2NH2NH_2NH_2) is a characteristic reaction of the carbonyl group (>C=O>C=O).

  1. Nucleophilic Addition: The nitrogen atom of hydrazine acts as a nucleophile (due to its lone pair of electrons) and attacks the electrophilic carbon of the carbonyl group. This is consistent with the behavior of carbonyl compounds described in organic chemistry principles [1], [2].
  2. Elimination: The intermediate addition product undergoes the elimination of a water molecule (H2OH_2O) to form the final product, a hydrazone (RCH=N−NH2RCH=N-NH_2).

Therefore, the overall mechanism is classified as Nucleophilic addition – elimination.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Aldehydes, Ketones and Carboxylic Acids. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAldehydes, Ketones and Carboxylic Acidsconsiderreactionrightarrowrchnnhreaction

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