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Consider the following alcohols:
The order of decreasing reactivities of these alcohols towards substitution with HBr is:

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III > I > IV > II

III > I > II > IV

I > III > IV > II

I > III > II > IV

answer is A.

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Detailed Solution

Substitution of -OH by Br atom takes place by carbocationic intermediate formation in rds. The stability of carbocation involved is as follows:

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