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  4. The reddish brown precipitate formed in the Fehling’s test for aldehydes (RCHO) is due to the formation of

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Q. The reddish brown precipitate formed in the Fehling’s test for aldehydes $(RCHO)$ is due to the formation of

KVPYKVPY 2017Aldehydes Ketones and Carboxylic Acids

Solution:

Fehling’s reagent is a mixture of aqueous copper sulphate and alkaline sodium potassium tartarate. When an aldehyde is heated with Fehling’s reagent a reddish brown precipitate is obtained and the aldehydes are oxidised to corresponding carboxylate anion. This reddish brown precipitate is due to the formation of copper oxide.
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