Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is D.

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Detailed Solution

Addition of HBr to propene yields 2-bromopropane. This is 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.
While in the presence of benzoyl peroxide, the same reaction yields 1 - bromopropane. This is in accordance with anti Markovnikov's rule. This happens in presence of peroxide and with HBr only. The reaction proceeds through free radical mechanism. The reaction involves formation of primary and secondary free radicals. Secondary free radical is more stable and preferentially formed.

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