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The mechanism is nucleophilic addition.

The cyanide anion attacks the partially positive carbon of the carbonyl function in acetaldehyde (the carbon is partially positive because of the negative mesomeric and inductive effect of the carbonyl function) forming a tertaïdic intermediate with an alkoxide-like oxygen.

A free electrobn pair of oxygen 'attacks' an other hydrogencyanide molecule which donates its proton (it is an acid) giving the end product 2-hydroxypropanenitrile.

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Q: How does acetaldehyde react with the hydrogen cyanide?
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