but how can free radical mechanism the way it is proposed be true ?
how can a polar bond cleave homolytically ?

i agree that hbr cleaves homolytically in presence of peroxide but here no such thing can happen .

@ridhima

it is not necessary that the sample must be irradiated u can also give other forms of energy but it must serve as the activation energy

. sandeep is prerfectly correct in terms of fact . i want 2 question it

 

please not here that a non polar bond usually cleaves homolytically whereas a  polar bond due to e.n difference cleaves heterolytically .

 

photon a chargeless species can disturb electron cloud density with its mere size ? it can provide activation energy but it itself never disturbs electron cloud density . the activation energy transmitted from the photons to the electron cloud increases their degrees of freedom and hence it cleaves due to increased internal energy .
@evryone

please comment..............