The formation of cyanohydrin from ketone is an example of :

Electrophilic addtion

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Nucleophilic addtion

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Nucleophilic substitution

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Electrophilic substitution

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Solution

The correct option is B Nucleophilic addtion
A cyanohydrin reaction is an organic chemical reaction by an aldehyde or ketone with a cyanide anion or a nitrile to form a cyanohydrin.
This nucleophilic addition is a reversible reaction but with aliphatic carbonyl compounds equilibrium is in favor of the reaction products. The cyanide source can be potassium cyanide, sodium cyanide or trimethylsilyl cyanide.

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