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NEET levelSingle correct optionDifficulty 1 of 3g1171

Which of the following free radicals is the most stable?

A $CH X_{2} = CH^{∙}$
B $CH X_{2} = CH - CH X_{2}^{∙}$
C $CH X_{3}^{∙}$
D $CH X_{3} CH X_{2}^{∙}$

Answer: B

The allyl radical is stabilised by resonance,

CH X_{2} = CH - CH X_{2} X^{∙} X_{∙} X_{2}^{2 ∙} CH X_{2} - CH = CH X_{2}

, delocalising the unpaired electron over two carbons. The other radicals have no resonance.

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