| Homolytic Reagent | Heterolytic Fission |
| 1. In this case, the covalent bond breaks symmetrically. | 1. In this case, the covalent bond breaks unsymmetrically. |
| 2. Each species, obtained, retains one electron from shared electron pair. | 2. The more electronegative atom retains the shared electron pair. |
| 3. Electrically neutral free radicals are formed which carry an old certain. | 3. Electrically charged ions (cations and anions) are formed. |
| 4. It takes place in the presence of sunlight, U.V. light or by pyrolysis. | 4. It takes place in the presence of polar solvent. |
