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MHT CET202522 Apr 2025Evening ShiftChemistryCarboxylic Acid DerivativesActual

Identify the reagent used in the following reaction. aligned Benzoic acid Reagent & Benzoyl chloride + Phosphorus oxychloride & + Hydrogen chloride aligned

Options

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

Correct answer

C. PCl ₅

Step-by-step solution

Benzoic acid undergoes conversion to benzoyl chloride with phosphorus pentachloride, as evidenced by the formation of phosphorus oxychloride and hydrogen chloride as byproducts. The reaction proceeds as: C ₆ H ₅ COOH + PCl ₅ C ₆ H ₅ COCl + POCl ₃ + HCl Alternative reagents yield different byproducts: phosphorus trichloride produces phosphorous acid ( H ₃ PO ₃ ), hydrochloric acid is ineffective for direct conversion, and thionyl chloride yields sulfur dioxide ( SO ₂ ). The correct reagent is therefore phosphorus pe

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