An organic compound $X$ gives a red precipitate on heating with Fehling's solution. Which one of the following reactions yields $X$ as a major product?

• A

  
  
• B

  $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{AgOH} \stackrel{\Delta}{\longrightarrow}$
• C

  $2 \mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{Ag}_2 \mathrm{O} \stackrel{\Delta}{\longrightarrow}$
• Correct answer
  D

  $\mathrm{C}_2 \mathrm{H}_2+\mathrm{H}_2 \mathrm{O} \underset{1 \% \mathrm{HgSO}_4 60^{\circ} \mathrm{C}}{\stackrel{40 \% \mathrm{H}_2 \mathrm{SO}_4}{\longrightarrow}}$

Solution

Acetaldehyde + Fehling's solution $\stackrel{\Delta}{\longrightarrow}$ Cuprous oxide (Red ppt.)

Hence, the correct answer is option: 'D'.