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Arrange the following alchols in the dec...

Arrange the following alchols in the decreasing order of their reactivity with `HRr` :
(1) `C_6 H_5CH_2OH`
(2) `(C_6H_5)_2 CHOH`
(3) `(C_6H_5)_3 COH`
(4) `p-O_2 NC_6H_4 CH_2OH`
(5) `p-C1C_6 H_4CH_2OH`.

Text Solution

Verified by Experts

Reactivity of alcohol with `HBr` depends on the stability of carbocation.
Stability of carbocation : `Ph C^(oplus) gt Ph_2 CH^(oplus) gt PHCH_2^(oplus) gt p-C1C_6H_6CH_2^(oplus) gt p-NO_2-C_6H_4 CH_2^(oplus)`.
So the order is : `3 gt 2 gt 1 gt 5 gt 4`.
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