AP EAMCET · Chemistry · Hydrocarbons

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

A $(A)$ and $(R)$ are correct, $(R)$ is the correct explanation of $(A)$
B $(A)$ and $(R)$ are correct but $(R)$ is not the correct explanation of $(A)$
C $(A)$ is correct but $(R)$ is not correct
D $(A)$ is not correct but $(R)$ is correct

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Answer & Solution

Correct Answer

(C) $(A)$ is correct but $(R)$ is not correct

Step-by-step Solution

Detailed explanation

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…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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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

Step-by-step Solution

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