Assertion ( A ) : Propene on addition with hydrogen bromide in the presence of peroxide gives 1 -…

Assertion (A): Propene on addition with hydrogen bromide in the presence of peroxide gives 1- Bromopropane as the major product

Reason (R): 1- Bromopropane is the major product because it is formed through the stable carbocation

  1. (A) and (R) are correct, (R) is the correct explanation of (A)
  2. (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. (A) is correct but (R) is not correct
  4. (A) is not correct but (R) is correct

Solution

When HBr is added to propene, in the presence of benzoyl peroxide, the reaction yields 1- bromopropane, accordance with anti Markovnikov's rule. The reaction proceeds through free radical mechanism.

Addition of HBr to propene yields 2-bromopropane, accordance with Markovnikov's rule. The reaction proceeds through ionic mechanism and involves formation of carbocation intermediate. Secondary carbocation is more stable than primary carbocation and is preferentially formed.

Asked in: AP EAMCET 2018 (25 Apr Shift 1)

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