What will be the order of reactivity of the following alcohols towards concentrated `HCl`?

Options

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

Answer

A

Explanation

The order of reactivity of an alcohol with `conc.HCl` is decided by the stability of the intermediate carbocation.Alcohol `(IV)` is most reactive as it leads to the formation of most stable benzyl cation. Others being `2^(@)` alcohol form the `2^(@)` cation with different stability order on account of presence or absence of `F` exerting `-I_("effect")`.