The order of reactivity of the following alcohols

towards conc. HCl is

Options

A. IgtIIgtIIIgtIV
B. IgtIIIgtIIgtIV
C. IVgtIIIgtIIgtI
D. IVgtIIIgtIgtII

Answer

C

Explanation

The order of reactivity depends upon the stability of the carbocations formed, i.e., `FCH_(2)overset(+)(C)HCH_(3),FCH_(2)CH_(2)overset(+)(C)HCH_(3),CH_(3)overset(+)(C)HCH_(3)` and `Phoverset(+)(C)H_(2)`. Since the relative stabilities of these carbocations follow the order:
`Ph overset(+)(C)H_(2) gt CH_(3)overset(+)(C)HCH_(3) gt FCH_(2)CH_(2)overset(+)(C)HCH_(3)`
`gtFCH_(2)overset(+)(C)HCH_(3)`, therefore, the order of reactivity of the alcohols (I,II,III and IV) follows the sequence: IVgtIIIgtIIgtI.