Which of the following cannot be converted to benzoic acid on reaction with KMnO4-KOH followed by H3O^+?(a) Ethyl benzene(b) Acetophenone(c) 4-Methylacetophenone(d) StyreneI had been asked this question by my school teacher while I was bunking the class.My question comes from Methods of Carboxylic Acids Preparation in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Which of the following cannot be converted to benzoic acid on reaction

1.	Which of the following cannot be converted to benzoic acid on reaction with KMnO4-KOH followed by H3O^+?(a) Ethyl benzene(b) Acetophenone(c) 4-Methylacetophenone(d) StyreneI had been asked this question by my school teacher while I was bunking the class.My question comes from Methods of Carboxylic Acids Preparation in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» RIGHT ANSWER is (c) 4-Methylacetophenone Easiest EXPLANATION: The ethyl group, acetyl group and ETHENE group are all oxidised to potassium carboxylate groups which are further oxidised to carboxyl groups. In the case of 4-Methylacetophenone, there are two groups that will be oxidised to carboxyl groups, hence forming terephthalic acid INSTEAD of benzoic acid.

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