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Arrange the following free radiacals in order of decreasing stability.
Methyl (I), Vinyl(II), Allyl(III), Benzyl(IV)
A. `I gt II gt 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`

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Correct Answer - D
Among the alkyl free radicals, tertiary alkyl free radicals are most stable and methyl free radicals is least stable.
Benzyl anf alkyl free radicals are resonance stabilized and are more stable than alkyl free radicals. Vinyl radical is least stable as the odd electron is present on `sp^(2)` C-atom.
image
Benzyl `(IV) gt "Allyl (III)" gt "Methyl (I)" gt "Vinyl (II)"`.

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