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Mark the correct increasing order of rea...

Mark the correct increasing order of reactivity of the following compounds with with HBr/HCl.

A

`I lt II lt III`

B

`II lt I lt III`

C

`II lt III lt I`

D

`III lt II lt I`

Text Solution

Verified by Experts

The correct Answer is:
C
All the three benzyl alcohols react with HBr/HCl through intermediate formation of carbocations. Obviously more stable the carbocation, more reactive is the alcohol. Now electron-withdrawing groups, i.e, `NO_(2),Cl,` etc. decrease the stability of carbocations. since the `-NO_(2)` group is a stronger electron-withdrawing group than -Cl, therefore, stability of carbocations increases in the order:

Therefore, reactivity of the benzyl alcohols increases in the same order, i.e, `II lt III lt I`. thus, option (c) is correct.
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