KMnO₄ (acidic/alkaline) is not decolourised by

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benzene

oxalic acid

propene

mohr salt

answer is C.

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Detailed Solution

Benzene does not decolourise KMnO₄ (acidic/alkaline). It is due to the delocalization of $π$ -electron in benzene. Mohr's salt and oxalic acid give redox reaction with KMnO₄. Propene decolorizes KMnO₄ due to presence of C = C bond.

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