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JEE Main levelSingle correct optionDifficulty 2 of 3hc151

tert-Butylbenzene is heated with hot alkaline $KMnO X_{4}$ and then acidified. The result (under the usual laboratory conditions) is

Athe side chain is not oxidised and the compound is recovered unchanged
Bbenzoic acid
Cacetophenone
Dbenzaldehyde

Answer: A

Side-chain oxidation of an alkylbenzene needs a benzylic hydrogen. The benzylic carbon of

C X_{6} H X_{5} - C (CH X_{3}) X_{3}

is quaternary and has none, so the side chain resists oxidation.

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