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MolSynapse / Question bank / Aldehydes, Ketones and Carboxylic Acids / Oxidation and reduction of carbonyls (Clemmensen, Wolff-Kishner, Tollens, Fehling)

NEET levelSingle correct optionDifficulty 1 of 3co141

The red precipitate formed when an aliphatic aldehyde is warmed with Fehling solution is

A $CuO$
B $Cu$
C $Cu X_{2} O$
D $Cu (OH) X_{2}$

Answer: C

The aldehyde is oxidised to a carboxylate and the

Cu X^{2 +}

tartrate complex is reduced to red cuprous oxide,

Cu X_{2} O

.

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