An alkene on vigorous oxidation with KMnO_4 gives only acetic acid. The alkene is [Manipal 2008]

JEE Main Chemistry question

An alkene on vigorous oxidation with KMnO gives only acetic acid. The alkene is [Manipal 2008]

(A)CHCHCH=CH
(B)CHCH=CHCHCorrect
(C)(CH)C=CH
(D)CHCH=CH

Answer: (B)

Solution

Vigorous (hot, concentrated) KMnO cleaves the C=C bond to carboxylic acids (from a =CHR carbon) or to CO (from a terminal =CH carbon). For the product to be *only* acetic acid (CHCOOH) —

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Question ID VK-142246