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(B) Fehling's reagent is a mixture of aqueous copper sulphate and alkaline sodium potassium tartrate.When an aldehyde is heated with Fehling's reagent

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$Cu_2O$

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(B) Fehling's reagent is a mixture of aqueous copper sulphate and alkaline sodium potassium tartrate.When an aldehyde is heated with Fehling's reagent,a reddish brown precipitate is obtained,and the aldehydes are oxidized to the corresponding carboxylate anion.This reddish brown precipitate is due to the formation of copper$(I)$ oxide.$RCHO + 2Cu^{2+} + 5OH^{-} \xrightarrow{\Delta} RCOO^{-} + Cu_2O \downarrow + 3H_2O$

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

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