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  4. On heating an aldehyde with Fehling's reagent, a reddish brown precipitate is obtained due to the formation of

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Q. On heating an aldehyde with Fehling's reagent, a reddish brown precipitate is obtained due to the formation of

AMUAMU 2018Aldehydes Ketones and Carboxylic Acids

Solution:

When an aliphatic aldehyde is heated with Fehling's solution, the latter is reduced to give a red ppt. of cuprous oxide. During this reduction, the following reactions occu
$\underset{\text{Aldehyde}}{{RCHO}}+\underset{\text{Fehling's solution}}{{2\, CU^{2+}}}+5OH^{-}\to \underset{\text{Carboxylate ion}}{{RCOO^{-}}}+\underset{\text{Cuprous oxide (Red ppt)}}{{Cu_{2}O ↓3H_{2}O}}$