If in the question contains vicinal dihalides , and treated with aqueous koh gives???
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Aqueous KOH is alkaline in nature i.e. it dissociates to produce a hydroxide ion. These hydroxide ions act as a strong nucleophile and replace the halogen atom in an alkyl halide.
RCl+KOH(aq)⟶ROH+KCl
This results in the formation of alcohol molecules and the reaction is known as nucleophilic substitution reaction.
Alcoholic, KOH, specially in ethanol, produces C2H5O− ions. The C2H5O− ion is a stronger base than the OH− ion. Thus,the former abstracts the ß-hydrogen of an alkyl halide to produce alkenes. This reaction is known as elimination reaction.
CH3CH2Br+KOH(alc)⟶H2C=CH2+KBr+H2O
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