Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy ?

Which of the following compounds possesses the C-H bond with the lowes

1.	Which of the following compounds possesses the C-H bond with the lowest bond dissociation energy ?
Answer» TOLUENE Benzene n-Pentane 2, 2-Dimethylpropane Solution :More stable the free radical formed upon homolytic fission of C-H bond, lesser is the bond dissociation energy. Since the stability of the radicals formed from toluene, benzene, n-pentane, 2, 2-dimethylpropane follows the order : `C_(6)H_(5)OVERSET()(C)H_(2) gt (CH_(3))_(3)overset()(C) gt CH_(3)overset()(C)HCH_(2)CH_(2)CH_(3) gt overset()(C_(6))H_(5)`, therefore, the C-H bond of toluene has the LOWEST bond dissociation energy.