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Solution


Q.

The total number of compounds from below when treated with hot KMnO4 giving benzoic acid is:           [2025]
1 3  
2 5  
3 4  
4 6  

Ans.

(2)

According to NTA following five compounds give benzoic acid upon oxidation with KMnO4, because presence of a benzylic hydrogen is necessary for oxidation of side chain to –COOH.

But if there is oxygen or multiple bond at benzylic position, then also oxidation occurs.