Two isomers ' A ' and ' B ' with molecular formula C 4 H 8 give different products on…

Two isomers 'A' and 'B' with molecular formula C4H8 give different products on oxidation with KMnO4 in acidic medium. Isomer 'A' on reaction 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.

Solution

The formula C4H8 shows that it has degree of unsaturation as one. And since it react with KMnO4 in acidic medium then it should be an alkene. Only the terminal alkene gives effervescence of carbon dioxide gas. So, it should be a terminal alkene. and other product is ketone so, it should have a 3 degree carbon too.  Based on these we can say that the A is

Asked in: JEE Main 2022 (29 Jun Shift 1)

Practice more Hydrocarbons questions on Aicharya