An alcoholic solution of KOH is used for dehydrohalogenation of haloalkane and results in the formation of Alkenes.
Alcoholic KOH dissociates in water to give RO- ions which is a strong base. It abstracts hydrogen, giving rise to elimination in reaction.
- We generally use alcoholic KOH to form Alkene from Alkyl Halides, whereas aqueous KOH is used to form alcohols from Alkyl Halides.
- Alcoholic KOH is used for dehydrohalogenation. A molecule of hydrogen halide is lost from alkyl halide to form an alkene.
CH3−CH2−Cl → CH2=CH2