JEE Main Chemistry question

Preparation of alkyl halides in the laboratory is least preferred by:

(A)Halide exchange
(B)Direct halogenation of alkanesCorrect
(C)Treatment of alcohols
(D)Addition of hydrogen halides to alkenes

Answer: (B)

Solution

Direct free-radical halogenation of alkanes typically gives poor regioselectivity, producing a mixture of several monohalogenated (and polyhalogenated) isomers that are difficult to separate, making it an impractical and least-preferred laboratory

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Question ID VK-148200