Question

The increasing order of the boiling point of the major products A, B, and C of the following reaction will be:
(a) (b) (c) \( + HBr \longrightarrow C \)

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• A. A < C < B
• B. A < B < C
• C. C < A < B
• D. B < C < A

Answer 1

The correct option is D B < C < A

Addition of HBr to alkene follows Markovnikov's rule.

Markovnikov's rule: When an unsymmetrical reagent is added to an unsymmetrical alkene, the negative part of the reagent is attached to the unsaturated C atom having less number of hydrogen atoms.

Addition of $HBr$ to alkene in presence of peroxide follows anti-Markovnikov rule.
(A) \( + HBr \longrightarrow Br \underset{>}{\longrightarrow} \) (B) (C)
The boiling points of isomeric haloalkanes decrease with increase in branching.

So, order of boiling point is,
A > C > B.

Hence, option (a) is correct.