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Which alkyl substituent on a benzene ring is NOT oxidised to a carboxyl group by KMnO4?
APrimary ethyl group
BTertiary butyl group
CSimple methyl group
DIsopropyl side chain
Answer & Solution
Correct answer: B. Tertiary butyl group
A tertiary alkyl group has no benzylic hydrogen, so it resists side-chain oxidation.
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