Question

$CH _{3}- CHO +2 Cu ^{2+}+ 5OH^- \xrightarrow{\Delta}$ Red brown ppt The change that occurs in the reaction is $Cu ^{2+} \longrightarrow Cu ^{x+}$
The value of $x$ is ____.

Answer 1

Acetaldehyde reacts with Fehling's solution to give red brown precipitate of copper(I) oxide or cuprous oxide.

So, $Cu ^{2+}$ ion $\longrightarrow Cu ^{1+}$ ion
$\therefore x=1$