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Why 3^@-butyl benzene does not give benz...

Why `3^@`-butyl benzene does not give benzoic acid on oxidation with hot alkaline `KMnO_4`?

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Alkyl benzene is oxidised to benzoic acid with hot alkaline `KMnO_4` when it has at least one benzylic hydrogen. Since `3^0`-butyl benzene has no benzylic hydrogen atoms it is not oxidised by hot alkaline `KMnO_4`.
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