Benzoic acid reacts with phosphorus pentaoxide in the presence of heat to give ________(a) C6H5OC6H5(b) C6H5COC6H5(c) C6H5COOC6H5(d) C6H5COOCOC6H5I had been asked this question by my college director while I was bunking the class.The doubt is from Carboxylic Acids Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Benzoic acid reacts with phosphorus pentaoxide in the presence of heat

1.	Benzoic acid reacts with phosphorus pentaoxide in the presence of heat to give ________(a) C6H5OC6H5(b) C6H5COC6H5(c) C6H5COOC6H5(d) C6H5COOCOC6H5I had been asked this question by my college director while I was bunking the class.The doubt is from Carboxylic Acids Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» Right option is (d) C6H5COOCOC6H5 Easiest EXPLANATION: Benzoic acid on heating with a strong dehydrating agent like P2O5 FORMS its corresponding anhydride, i.e., benzoic anhydride, which CONSISTS of TWO C6H5C=O groups bridged by a (-O-) GROUP.

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