Brick red precipitates are formed when aldehydes react with:
Correct answer: D. Fehling's solution
- A. Sodium borohydride
- B. Sodium bisulphite
- C. Sodium nitroprusside
- D. Fehling's solution
Explanation
A is incorrect as sodium borohydrides converts carbonyl compounds to B is incorrect as sodium bisulphate reacts with carbonyl compounds to give white precipitate,rather than red precipitate.C is incorrect as sodium nitropresside test is done to test the presence of ketones.D is correct as Fehling Solutions produce brick red precipitate when reacted with carbonyl compounds.The red colour is an indication of cuprous oxide.
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About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
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