Question
Identify the reagent used in following reaction. Benzoic acid [ ] Reagent Benzoyl chloride + phosphorous oxychloride + Hydrogen chloride
MHT CET
Chemistry
Carboxylic Acid Derivatives
2026
MHT CET 2026 (19 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. PCl _3
- B. HCl
- C. PCl _5
- D. SOCl _2
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
Related: Chemistry — Carboxylic Acid Derivatives · All PYQ Banks