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Q.

Preparation of alkyl halides in laboratory is least preferred by

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a

Halide exchange

b

Direct halogenation of alkanes

c

Treatment of alcohols

d

Addition of hydrogen halides to alkenes

answer is B.

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Detailed Solution

Direct halogenation of alkenes are not preferred because in it, a mixture of monohalogen, dihalogen, trihalogen and tetrahalogen substituted products are obtained, which are difficult to separate.
e.g. ${CH}_{4} \overset{{Cl}_{2}}{⟶} {CH}_{3} Cl \overset{{Cl}_{2}}{⟶} {CH}_{2} {Cl}_{2}$ $\overset{{Cl}_{2}}{⟶} {CHCl}_{3} \overset{{Cl}_{2}}{⟶} {CCl}_{4}$

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