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MHT CET202613 April 2026Morning ShiftChemistryAldehydes and KetonesActual

Identify the reagent used in the transformation of Ketone into semicarbazone.

Options

  1. ANH ₂- OH
  2. BNH ₂- NH ₂
  3. CNH ₂- NH - CONH ₂
  4. DNH ₂- NH - C ₆ H ₅

Correct answer

C. NH ₂- NH - CONH ₂

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-

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