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MHT CET202519 Apr 2025Morning ShiftChemistryAldehydes and KetonesActual

Identify the reagent R used in following reaction. Ketone R semi carbazone

Options

  1. ANH ₂ OH
  2. BNH ₂ NHCONH ₂
  3. CNH ₂ NHC ₆ H ₅
  4. DNH ₂- NH ₂

Correct answer

B. NH ₂ NHCONH ₂

Step-by-step solution

A semicarbazone is specifically produced by the reaction of a ketone with semicarbazide, NH ₂ NHCONH ₂ . Semicarbazide reacts with ketones to yield the semicarbazone derivative R ₂ C = NNHCONH ₂ . Hydroxylamine ( NH ₂ OH ) forms oximes, phenylhydrazine ( NH ₂ NHC ₆ H ₅ ) forms phenylhydrazones, and hydrazine ( NH ₂ NH ₂ ) yields hydrazones-none produce semicarbazones. The correct reagent is semicarbazide. Final answer: B

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