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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

When ethanal is treated with Fehling's solution, it gives a precipitate of

A

Cu2OCu_{2}O

B

CuCu

C

Cu3OCu_{3}O

D

CuOCuO

Answer

Cu2OCu_{2}O

Explanation

Solution

Fehling's solution is reduced by aldehydes and a red precipitate of Cu2OCu _{2} O is obtained.
CH3CHOethanal+2CuO(from Fehling solution)→CH3COOH+Cu2O↓red ppt.\underset{\text{ethanal}}{CH_3CHO} + \underset{\text{(from Fehling solution)}}{2CuO} \rightarrow CH_3COOH + \underset{\text{red ppt.}}{Cu_2O \downarrow}