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  4. How many of the following compunds will give Benzoic acid on treating with acidic KMnO4 ? <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-ef9tjitjbqrvyjqd.jpg /> .

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Q. How many of the following compunds will give Benzoic acid on treating with acidic $KMnO_{4}$ ?
Question
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NTA AbhyasNTA Abhyas 2022

Solution:

In case of aromatic compounds, the complete side chain (consisting of an alkyl group) is oxidised to - $COOH$ group irrespective of the length of the chain if it contains at least one benzylic Hydrogen.
Solution
Only I, II, V will give benzoic acid on oxidation.