Question

why alcKOH gives gives elimination

Answer 1

it is not alcKOH it is alcohol

Answer 2

Hey, mate here is your answer✌✌》》

Aqueous KOH is alkaline in nature i.e. It gives OH-.
These hydroxyde ions ions which act as strong nucleophile and replace halogen atom from alkyl halide.
RCl + KOH (aq.) → ROH.
This results in the formation of alcohol molecules and the reaction is known as nucleophil substitution reaction.
Alcoholic, KOH , specially in ethylene alcohol, produce C2H5O- ions. These ions are stronger base than OH- ion. Thus they abstracts the ß-hydrogen of alkyl halide to produce alkene. This reaction is known as elemenation reaction.
CH3CH2Br + KOH (alc.) → H2C=CH2 + KBr + H2O

Hope this answer will help you..《《

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@1Angel12