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Two isomers 'A' and 'B' with molecular formula C4H8 give different products on oxidation with KMnO4 / H+ 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 propene

Correct answer: 2-methyl propene

Solution

2-methyl propene is a branched alkene that, upon oxidation with KMnO4, produces a ketone and releases gas due to the formation of a stable product. In contrast, the other isomers either do not yield a ketone or do not produce gas during the reaction.

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