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Arrange the following free radicals in t...

Arrange the following free radicals in the order of decreasing stability: methyl `(I)`, vinyl `(II)`, allyl `(III)`, benzyl `(IV)`

A

`I gt IIgt III gt IV`

B

`III gt II gt I gt IV`

C

`II gt I gt IV gt III`

D

`IV gt III gt I gt II`

Text Solution

Verified by Experts

The correct Answer is:
D
Benzyl `(C_(6)H_(5)overset(*)(C)H_(2))` with `5` resonance structure is the most stable. Allyl radical has two resonance structures. Vinyl is the least stable as odd `e^(-)` is carried by `sp^(2)` hybrid `C`.
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