CBSE - XII Science - Chemistry - Haloalkanes and Haloarenes
Substitution vs elimination
Aqueous KOH is almost completely ionised and contains a large number of heavily hydrated OH- ions which are strong nucleophile and bring out sustitutuin reaction,while alcoholic solution if KOh gives alkoxide ions which is strong base than OH- so, that is why The treatment of alkyl chlorides with aq. KOH leads to formation of alcohols but in presence of alcoholic KOH , alenes are the major product.
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