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MHT CET202619 April 2026Evening ShiftChemistryCarboxylic Acid DerivativesActual

Identify the reagent used in following reaction. Benzoic acid [ ] Reagent Benzoyl chloride + phosphorous oxychloride + Hydrogen chloride

Options

  1. APCl ₃
  2. BHCl
  3. CPCl ₅
  4. DSOCl ₂

Correct answer

C. PCl ₅

Step-by-step solution

The reaction of benzoic acid with phosphorus pentachloride ( PCl ₅ ) yields benzoyl chloride, phosphorus oxychloride ( POCl ₃ ), and hydrogen chloride ( HCl ). C ₆ H ₅ COOH + PCl ₅ C ₆ H ₅ COCl + POCl ₃ + HCl Thus, the reagent used is PCl ₅ . Answer: PCl ₅

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