Question

Write IUPAC name of the complex $\left[Co\right(en{)}_2\left(H_{2}O\right)\left(CN\right){]}^{2+}$.

Answer 1

Oxidation state of $Co$ in the given compound-

$x+(2\times 0)+0+(-1)=+2$

$\Rightarrow x=2+1=+3$

$\therefore$ Oxidation state of cobalt in the given compound is $+3$.

The compound has $4$ ligands-

$1$ aqua ligand $\left(H_{2}O\right)$

$1$ cyano ligand $\left(CN\right)$

$2$ ethylene-di-amine ligands $\left(en\right)$

Thus the IUPAC name of the given compound is aquacyanobis-(ethylenediamine)cobalt (III) ion.