Mark the reaction among the following that does not give benzoic acid as the major product:

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Accepted Answer

The question tests the knowledge of oxidation reactions yielding carboxylic acids versus aldehydes.
1.  **Haloform Reaction:** Acetophenone ($C_6H_5COCH_3$) contains a methyl ketone group. Treatment with $NaOBr$ (sodium hypobromite) followed by acidification oxidises it to **Benzoic acid** ($C_6H_5COOH$).
2.  **Side-Chain Oxidation:** Alkylbenzenes like Toluene ($C_6H_5CH_3$) having at least one benzylic hydrogen are oxidised by strong oxidising agents like alkaline $KMnO_4$ to **Benzoic acid**.
3.  **Hydrolysis of Nitriles:** Benzonitrile ($C_6H_5CN$) upon complete acid hydrolysis ($H_3O^+$) yields **Benzoic acid**.
4.  **Mild Oxidation:** **PCC** (Pyridinium Chlorochromate) is a mild oxidising agent used to convert primary alcohols to aldehydes. It prevents further oxidation to carboxylic acids. Therefore, the reaction of Benzyl alcohol ($C_6H_5CH_2OH$) with PCC yields **Benzaldehyde** ($C_6H_5CHO$), not benzoic acid.

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