how does acetaldehyde reacts with sodium bisulphite
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Aldehydes react with sodium bisulphite (sodium hydrogen sulphite) to give addition products. Ketones, except for methyl ketones, do not react with sodium bisulphite due to steric hinderance (crowding).
Acetophenone (C6H5COCH3) does not give addition product with sodium bisulphite (NaHSO3) solution. This is because two bulkier groups are attached with the carbonyl carbon. These groups decrease the reactivity of carbonyl carbon.
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