The very best proposal We've for what is happening is development of the cyclic halonium ion, and that is a three-membered ring bearing a optimistic formal charge on the halogen. The predominance of allylic substitution more than other positions is predicated on bond dissociation energies. An allylic C-H bond features https://jaideneazul.pointblog.net/solution-de-bromoforme-an-overview-84867393