Question

Which of the following compound cannot reduce Fehling solution?

• A. $HCOOH$
• B. $C{H}_{3}COOH$
• C. $HCHO$
• D. $C{H}_{3}CHO$

Answer 1

Answer: (B)

Aldehyde reacts with Fehling solution to give carboxylic acid and red ppt. of $C{u}_{2}O$. But carboxylic acid except formic acid cannot reduce Fehling solution due to the presence of alkyl group in carboxylic acid.
$HCOOH+\underset{\text{ Fehling solution }}{2CuO}⟶C{u}_{2}O+C{O}_2+H_{2}O$
$C{H}_{3}COOH+\underset{\text{Fehling solution }}{2CuO}⟶X$