Question

When acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that?

• A. $Cu_{2}O$
• B. $Cu$
• C. $CuO$
• D. $CuSO_{4}$

Answer 1

Answer: (A)

$Cu_{2}O$

Answer 2

When acetaldehyde is heated with Fehling solution, a red precipitate of $Cu _{2} O$ is obtained. $CH _{3} CHO +2 Cu ( OH )_{2}+ NaOH \longrightarrow$ $CH _{3} COONa + \underset{\text{red}}{Cu _{2}} O \downarrow+3 H _{2} O$