Alkyl Halides and Aryl HalidesHard

Question

Consider the following alcohols.
 
       I                                      II

                   III                                  IV
The order of decreasing reactivities of these alcohols towards nucleophilic substitution with HBr is

Options

A.III >  I > IV > II
B.III > I > II > IV
C.I > III > IV > II
D.I > III > II > IV

Solution

according to carbocation stability after OH‾ leaves

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