The order of reactivity of the following alcohols towards conc. `HCI` is
I. II.
III. IV.

Options

A. `Igt II gtIII gtIV`
B. `I gt III gtIIgt IV`
C. `IVgtIIIgt II gt I`
D. `IV gt IIIgt I gt II`

Answer

C

Explanation

The order of reactivity dependsw upon the stability of the carbocations fromed.
Stability of carbocations is in the order.
`underset(I(2^(@),F"nearer"))(FCH_(2)overset(+)CHCH_(3))ltunderset(II(2^(@),F away))(FCH_(2)CH_(2)overset(+)CHCH_(3))ltunderset(III(2^(@)))(CH_(3)overset(+)CHCH_(3))ltunderset(IV(Benzyl))(PHoverset(+)CH_(2))`
Hence the order of relative reactivity of the alcohols will follow the order: `IV gt III gt II gt I`