When acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is…
When acetaldehyde is heated with Fehling solution, a red precipitate is formed. Which of the following is that?
$\mathrm{Cu}_2 \mathrm{O}$
$\mathrm{Cu}$
$\mathrm{CuO}$
$\mathrm{CuSO}_4$
Solution
When acetaldehyde is heated with Fehling solution, a red precipitate of $\mathrm{Cu}_2 \mathrm{O}$ is obtained.
$\mathrm{CH}_3 \mathrm{CHO}+2 \mathrm{Cu}(\mathrm{OH})_2+\mathrm{NaOH} \longrightarrow$\mathrm{CH}_3 \cdot \mathrm{COONa}+\mathrm{Cu}_2 \mathrm{O} \downarrow(Red)+3 \mathrm{H}_2 \mathrm{O}$