Which of the following free radicals are stabilised by resonance?

A $CH X_{3} CH X_{2} CH X_{2}^{∙}$
B $CH X_{3} - CH^{∙} - CH X_{3}$
C $CH X_{2} = CH - CH X_{2}^{∙}$
D $C X_{6} H X_{5} CH X_{2}^{∙}$

Answer: C, D

The allyl and benzyl radicals delocalise the unpaired electron through a neighbouring pi system. The propyl and isopropyl radicals have only hyperconjugation.

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Which of the following free radicals are stabilised by resonance?

Answer: C, D

More questions on Applications: stability of carbocations, carbanions, free radicals