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 ?

Options

A. `HCHO overset((i)CH_(3)Mgl)underset((ii) H_(2)O) to `
B. `C_(2)H_(5)Br+AgOH overset(Delta)to`
C. `2C_(2)H_(2)Br+Ag_(2)O overset(Delta)`
D. `C_(2)H_(2)+H_(2)O overset(40% H_(2)SO_(4)) underset(1% HgSO_(4), 60^(C)) to`

Answer

D

Explanation

`C_(2)H_(2)+H_(2)O overset(40% H_(2)SO_(4)) underset(1% HgSO_(4), 60^(@)C)to underset("Acetaldehyde")(CH_(3)CHO)`
Acetaldehyde +Fehlling solution `overset(Delta) to` Cuprous oxide (Red ppt)