Question

Potassium hydroxide is both alkali as well as base. Give reason .
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Answer 1

Explanation:

Pottasium hydroxide is both alkali as well as base because potassium hydroxide is soluble in water and it is an example of base....

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Answer 2

Answer:

R−Cl+KOH(aq)→R−OH+KCl

The ionization of aqueous KOH produces hydroxide ions which are strong nucleophiles. Hence, alkyl chlorides undergo substitution to form alcohol.

R−CH

2

−CH

2

−Cl+KOH(alc)→R−CH=CH

2

+KCl+H

2

O

Alcoholic KOH solution gives alkoxide ion which is a strong base. It abstracts β hydrogen atom of alkyl chloride. A molecule of HCl is eliminated and an alkene is formed.

Note: The basicity of hydroxide ion is much lower than the basicity of alkoxide ion as hydroxide ion is significantly hydrated in aqueous solution.

Hence, hydroxide ion cannot abstract β hydrogen atom of alkyl chloride.

Explanation:

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