How many compounds among following give white crystals when reacted with sodium bisulphite.

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Solution

The correct option is B 2
All aldehyde form hydroxy sulphonates but not all ketones react due to steric hinderance. Due to bulky groups nucleophiles are less approachable to the carbonyl carbon
(a) and (b) react with sodium bisulphate as shown:

(c) and (d) ketones:

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N a H S O_{3}

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