Preparation of alkyl halides in laboratory is least preferred by :

Halide exchange

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Direct halogenation of alkanes

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Treatment of alcohols

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Addition of hydrogen halides to alkenes

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Solution

The correct option is B Direct halogenation of alkanes
Preparation of alkyl halides are least preffered by direct halogenation becuase it gives a mixture of mono substituted,di subtituted and tri substituted alkyl halide derivatives which are not desired.Hence direct halogenation is not prepared

Hence B is correct answer

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Preparation of alkyl halides in laboratory is least preferred by

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Which of the following reagent is preferred to prepare alkyl halides from alcohols?

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