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

Options

A. `I gt II gt III gt IV`
B. `I gt III gt II gt IV`
C. `IV gt III gt II gt I`
D. `IV gt III gt I gt II`

Answer

C

Explanation

This linked with the relative stability of the carbocations formed
`Phoverset(o+)(C)H_(2) (IV) gt CH_(3) overset(o+)(C)HCH_(3) (III)`
`gt F-CH_(2)-CH_(2)-overset(o+)(C)H-CH_(3)(II)`
`gt F-CH_(2)-overset(o+)(C)H-CH_(3) (I)`