Assertion:1-butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane. Reason: It involves the formation of a primary radical.

The general reaction 1-butene with HBr in the presence of peroxide is shown as follows: 3 2 2 3 2 2 2 CH –CH –CH=CH +HBr + peroxide CH –CH –CH –CH Br → The major product formed here is 1-bromo butane due to peroxide or Kharasch effect.