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(A) The bond dissociation energy of a $C-H$ bond depends on the stability of the radical formed after the homolytic cleavage of the bond. Greater the

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Toluene

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(A) The bond dissociation energy of a $C-H$ bond depends on the stability of the radical formed after the homolytic cleavage of the bond. Greater the stability of the resulting radical,lower is the bond dissociation energy. In $Toluene$ $(C_6H_5CH_3)$,the cleavage of a $C-H$ bond from the methyl group produces a benzyl radical $(C_6H_5CH_2^{\bullet})$,which is highly stabilized by resonance with the benzene ring. In $Benzene$,the $C-H$ bond is $sp^2$ hybridized and the radical is less stable. In $n-$Pentane and $2,2-$Dimethylpropane,the radicals formed are alkyl radicals,which are less stable than the resonance-stabilized benzyl radical. Therefore,the $C-H$ bond in the methyl group of $Toluene$ has the lowest bond dissociation energy.

In which of the following compounds does the $C-H$ bond exhibit the lowest bond dissociation energy?

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