Which of the following reaction(s) can be used for the preparation of alkyl halides ?
`(i) CH_(3) CH_(2)OH+HCl overset("anhyd."ZnCl_(2))(to)`
(ii) `CH_(3)CH_(2)OH+HCl to `
`(iii) (CH_(3))_(3)C-OH +HCl to `
`(iv) (CH_(3))_(2) CHOH +HCl overset("anhyd"ZnCl_(2))(to)`

Options

A. (IV) only
B. (III) and (IV) only
C. (I), (III) and (IV) only
D. (I) and (II) only

Answer

C

Explanation

Luca's reagent can be used for `[HCl+ZnCl_(2)]`
`1^(@)//2^(@)//3^(@)`-alcohol but if `ZnCl_(2)` is absent than only `3^(@)` alcohol can be used because it is most reactive due to `3^(@)` carbocation.