Q. Which of the following reaction(s) can be used for the preparation of alkyl halides ?\n(I) $CH_3CH_2OH + HCl \xrightarrow{anh.\ ZnCl_2}$\n(II) $CH_3CH_2OH + HCl \rightarrow$\n(III) $(CH_3)_3COH + HCl \rightarrow$\n(IV) $(CH_3)_2CHOH + HCl \xrightarrow{anh.\ ZnCl_2}$
A) (IV) only
B) (III) and (IV) only
C) (I), (III) and (IV) only
D) (I) and (II) only
Explanation
[Solution] (I) and (IV) work with anhydrous $ZnCl_2$ (Lucas reagent); (III) works without it because the tertiary carbocation is stable. Primary alcohol with HCl alone (II) does not react. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.