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Benzoic acid is obtained from the oxidation of _______ with alkaline KMnO4 followed by treatment with mineral acid.

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Benzoic acid is obtained from the oxidation of _______ with alkaline KMnO4 followed by treatment with mineral acid.

(a) phenol

(b) benzaldehyde

(c) acetophenone

(d) benzyl alcohol

This question was addressed to me during an online exam.

Asked question is from Methods of Carboxylic Acids Preparation in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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The correct option is (d) benzyl alcohol

The explanation is: Only primary alcohols undergo oxidation in the presence of common oxidising agents followed by reaction with H3O^+ to give the respective carboxylic acids. This reaction is proceeded by the removal of both hydrogen atoms from the alpha carbon and formation of a double bond between C and O.

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