Question

When haloalkane react with aqueous. koh gives ethanol as main product while when we react with alcoholic k o h gives alkene as main product. Why......

Answer 1

Answer:

when haloalkane react with aqueous KOH it form alcohol .It is nucleophilic substitution reaction. The nucleophile X- (halide) is been replaced by OH- group.

While when haloalkane react with alcoholic KOH it favour dehydrohalogenation elimination reaction . In this reaction Alpha hydrogen and halogen atom get eliminated thus producing alkene.

Answer 2

$\huge\bigstar\underline\pink{Answer}$

Reason:-

Aqueous .KOH is weak nucleophile

so, NSR ( nucleaphic substitution reaction takes place)

Here, -OH group replaces the alkyl group to give Ethanol

but,

Alcoholic.KOH is strong nucleophile

here Elimination reaction takes place

So, alkyl group is removed as a result double bond is formed.

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