MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

The transformation of a ketone into a semicarbazone involves the reaction of the ketone with semicarbazide. The chemical formula of semicarbazide is NH _2- NH - CONH _2. The reaction proceeds via nucleophilic addition followed by the elimination of a water molecule, resulting in the formation of a semicarbazone (> C = N - NH - CONH _2). Other reagents given: NH _2- OH (hydroxylamine) forms an oxime. NH _2- NH _2 (hydrazine) forms a hydrazone. NH _2- NH - C _6 H _5 (phenylhydrazine) forms a phenylhydrazone. Answer: NH _2- NH - CONH _2