Two isomers 'A' and 'B' with molecular formula C_ 4 H_ 8 give different products on oxidation with KMnO_ 4 /H^ + results in effervescence of a gas and gives ketone. The compound 'A' is -

JEE Main 2022 Chemistry question

Two isomers 'A' and 'B' with molecular formula give different products on oxidation with results in effervescence of a gas and gives ketone. The compound 'A' is -

(1)But-1-ene
(2)cis-But-2-ene
(3)trans-But-2-ene
(4)2-methyl propeneCorrect

Answer: (4)

Solution

Oxidation with gives a ketone and effervescence of only when the alkene has a terminal group on a disubstituted carbon:

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Question ID VK-035298