Which of the following reaction(s) can be used for the preparation of alkyl halides? [2015]

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Solution

Q.
Which of the following reaction(s) can be used for the preparation of alkyl halides [2015]

(I)   ${CH}_{3} {CH}_{2} OH + HCl \overset{Anh . {ZnCl}_{2}}{\to}$
(II)   ${CH}_{3} {CH}_{2} OH + HCl \to$
(III)   ${({CH}_{3})}_{3} COH + HCl \to$
(IV)   ${({CH}_{3})}_{2} CHOH + HCl \overset{Anh . {ZnCl}_{2}}{\to}$

1 (I) and (II) only

2 (IV) only

3 (III) and (IV) only

4 (I), (III) and (IV) only

Ans.
(4)

1° and 2° alcohols react with HCl in presence of anhydrous ${ZnCl}_{2}$ as catalyst while in case of 3° alcohols anhydrous ${ZnCl}_{2}$ is not required.

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