In a radical reaction, the termination step happens when two radicals meet and combine to form a stable, non-reactive molecule. This step removes reactive radicals from the reaction mixture, which has several effects:
- Stops the chain reaction – Radical reactions usually proceed in a chain-like manner, with radicals generating more radicals. Termination stops this chain by eliminating radicals.
- Limits product formation – Because radicals are removed, fewer of them are available to continue forming the desired product, so the overall yield can decrease.
- Can create side products – When two radicals combine, they sometimes form products that were not the main target of the reaction.
In short, termination is essential for controlling the reaction, preventing it from running out of control, and influencing what products are formed.