Question

Compound formed from hydrogenation of $B$ ,other than $D$ has p-block central atom whose oxidation state is :

Answer 1

$CuC{O}_3⟶CuO+C{O}_2\uparrow$

$CuO+H_2⟶Cu\left(s\right)+H_{2}O$

After hydrogenating $B$ we get $Cu\left(s\right)+H_{2}O\to$here the $p$ block element is oxygen and its oxidation state is $2$