Which of the following free radical is most stable ?

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Tertiary

Secondary

Primary

Methyl

answer is C.

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Detailed Solution

The stability of free radicals is same as that of carbocations. Like carbocations, tertiary radical is more stable than secondary and primary radical.
This can be explained by +I effect of the alkyl groups attached to carbon radicals.
The more is the number of alkyl groups attached to the carbon radical, the more is the availability of e−and more is the stabilization.

So tertiary free radical is more stabilized than secondary and primary.

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