R3.3 Electron sharing reactions
This section looks at the formation and reactivity of free radicals formed by the homolytic fission of covalent bonds by ultraviolet light. The initiation, propagation and termination steps for the substitution reactions of halogens with alkanes are discussed. It also includes the use of 'fish hooks' to show the movement of single electrons and the role of free radicals formed from the breakdown of CFCs in ozone...