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Mark the correct increasing order of rea...

Mark the correct increasing order of reactivity of the following compounds 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/HCI through the formation of intermediate carbocation. More stable the carbocation, more reactive is the alcohol. The electron releasing groups i.e. `NO_(2)Cl,` group is stronger electron withdrawing than `-CI` group, therefore, stability of carbocation increases in the order:

Therefore, the reactivity of benzyl alcohols increases in the order : `II lt III lt I`.
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