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Aldehydes and ketones will not form crystalline derivatives with

1. Sodium bisulphite
2. Phenylhydrazine
3. Semicarbazide hydrochloride
4. Dihydrogen sodium phosphate

Correct answer: Dihydrogen sodium phosphate

Solution

Aldehydes and ketones form crystalline derivatives with reagents like sodium bisulphite, phenylhydrazine, and semicarbazide hydrochloride. However, dihydrogen sodium phosphate does not react with them to form such derivatives.

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