Two isomers $A$ and $B$ with molecular formula $C_4H_8$ give different products on oxidation with $KMnO_4$ in acidic medium. Isomer $A$ on reaction with $KMnO_4 / H^{+}$ results in effervescence of a gas and gives a ketone. The compound $A$ is ...... .
- Abut$-1-$ene
- Bcis-but$-2-$ene
- Ctrans-but$-2-$ene
- D$2-$methylpropene
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