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Give nucleophilic addition reaction of a...

Give nucleophilic addition reaction of acetaldehyde with (a) `NaHSO_(3)`, and (b) `LiAlH_(4)`.

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Addition reaction with `NaHSO_(3)` :
In the addition of sodium bisulphite to give bisulphite compound - `OSO_(2)Na` anion is the nucleophile.
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