Why haloalkanes reacts with aq. KOH to give alcohol but with alc. KOH gives alkene? With reactions
In an aqueous solution, KOH ionises completely to give OH-ions. OH-ion is a strong nucleophile, causing alkyl chloride to undergo a substitution reaction to form alcohol.
Whereas Alcoholic KOH is a strong base soit can abstract a hydrogen from the β-carbon of the alkyl chloride and form an alkene by eliminating a molecule of HCl.