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  4. An alkene on vigorous oxidation with KMnO4 gives only acetic acid. The alkene is

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Q. An alkene on vigorous oxidation with $ KMn{{O}_{4}} $ gives only acetic acid. The alkene is

ManipalManipal 2008

Solution:

Since the alkene on oxidation gives only acetic acid, therefore, the alkene must be symmetrical containing two carbon-atoms on either side of the double bond, ie, $2$-butene
$CH_3CH=CHCH_3 \ce{->[KMnO_4]} 2CH_3COOH$