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Question

How many compounds among following give white crystals when reacted with sodium bisulphite.
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A
2
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B
3
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C
4
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D
5
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Solution

The correct option is A 2
Not react with sodium bisulphite due to steric hinderance as groups present at both side of carbonyl groups are bulky. The reaction of carbonyl compounds with NaHSO3 proceeds in aqueous solution attack of nucleophilic bisulphite ion an carbonyl carbon, involving nucleophilic addition mechanism. All aldehyde form hydroxy sulphonates but not all ketones react due to steric effects as refer in the above reactions.
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