The dehydrohalogenation of an alkyl halide to produce an alkene can be brought about by using

1. The reagent used to dehydrohalogenate alkyl halides is known as KOH.
2. When we use alcoholic potassium hydroxide, also known as KOH, as a reagent, the negative part of the reagent, OH, acts as a base and abstracts the beta hydrogen from the saturated substrate (alkyl hallide) present and trasforms it to an alkene in the product, going through an elimination reaction.