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NEET levelSingle correct optionDifficulty 1 of 3o1174

Which reagent converts benzoic acid into benzoyl chloride so that all by-products are gases?

A $PCl X_{5}$
B $PCl X_{3}$
Cdry $HCl$ gas
D $SOCl X_{2}$

Answer: D

C X_{6} H X_{5} COOH + SOCl X_{2} C X_{6} H X_{5} COCl + SO X_{2} + HCl

; both by-products escape as gases.

PCl X_{5}

leaves liquid

POCl X_{3}

,

PCl X_{3}

leaves

H X_{3} PO X_{3}

, and HCl alone does not convert the acid.

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