Question

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Difference between reaction of alkene with KOH(aq) and with alc. KOH ??​

Answer 1

Answer:

There is a vast difference between these two. Alc KOH dissociates in water to give RO- ions which is a strong base and abstracts hydrogen giving rise to elimination where Aq KOH dissociates in water giving - OH ions which is a good nucleophile and prefers substitution.

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Answer 2

Explanation:

There is a vast difference between using the same reagent in two different s

olvents as in here.

Basically, when we use Alcoholic potassium hydroxide i.e, KOH as a reagent, the negative part of the reagent, that is OH- it acts a a base and abstracts the beta Hydrogen from the saturated substrate( alkyl hallide) present and trasforms it to an alkene in the product, thereby undergoing Elimination reaction.

On the other hand, when we use aqueous potassium hydroxide, i.e, KOH as a reagent, the negative part of the reagent, that is OH- acts a nucleophile and attacks the alpha Carbon atom of the substrate i.e, alkyl hallide, and gives an alcohol as the product, thereby undergoing Substitution reaction.