Q. Two isomers ' $A$ ' and ' $B$ ' with molecular formula $C _{4} H _{8}$ 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 ketone. The compound ' $A$ ' is
Solution:
Correct answer is (d) 2-methyl propene