What is the use of alcoholic solution of KOH?

An alcoholic solution of KOH is used for dehydrohalogenation of haloalkane and results in the formation of Alkenes.

Explanation

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

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