why alc KOH form alke but aq KOH form alcohol with treating with haloalkane
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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
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
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