How does homolysis differ from heterolysis in a chemical reaction?

In chemistry, the distinction between homolysis and heterolysis lies in how a covalent bond—which consists of a pair of shared electrons—is broken.1

Homolysis

Homolysis is the process in which the two electrons of a covalent bond are split equally between the two atoms or groups that were previously bonded. Because each fragment retains one electron from the original pair, the resulting products are neutral species known as free radicals. These reactions are often referred to as having homolytic or free-radical mechanisms.12

Heterolysis

In contrast, heterolysis is the reverse of a coordination process, where the covalent bond breaks such that both electrons of the shared pair remain with only one of the two atoms or groups. This typically results in the formation of charged species (ions) rather than neutral radicals.1

In summary, while homolysis involves the symmetrical cleavage of a bond to produce radicals, heterolysis involves the asymmetrical cleavage of a bond, resulting in the unequal distribution of the bonding electrons.1