# Why is halogenation important?

Radical halogenation (or hydrohalogenation of olefins) allows the introduction of an halide group at a predictable position on the carbon chain. This $C - X$ can be hydrolyzed to give alcohols, the which can be further oxidized to give ketones and aldehydes and acids. Of course $C - X$ can be eliminated to give olefins, or substituted by amines to give nitrogen containing species. So in short, halogenation offers opportunities for reactivity and elaboration of products.