COMEDK20269 May 2026Evening ShiftChemistryHydrocarbonsActual
The statements given below contains assertion and reason. Choose the correct option Assertion (A): Propene reacts with HBr in presence of organic peroxide gives 1-bromopropane. Reason(R): The reaction occurs through carbocation intermediate
Options
- AA is false but R is true
- BA is true but R is false
- CBoth A and R are true but R is not the correct explanation of A
- DBoth A and R are true, R is the correct explanation of A
Correct answer
B. A is true but R is false
Step-by-step solution
Propene reacts with HBr in the presence of an organic peroxide to give 1-bromopropane. This is known as the peroxide effect or Kharasch effect, which follows anti-Markovnikov addition. Thus, the assertion is true. The reaction proceeds via a free radical mechanism involving a more stable secondary free radical intermediate, not a carbocation intermediate. Thus, the reason is false. Answer: A is true but R is false