Question

The IUPAC name of the complex $\left[Cr{Cl}_2{\left(H_{2}O\right)}_4\right]N{O}_3$ is :

• A. Dichlorotetraaquachromium(III) nitrate
• B. Tetraaquadichlorochromium(III) nitrate
• C. Chromiumtetraaquadichloro nitrate
• D. Dichlorotetraaquadnromium nitrate

Answer 1

The correct option is B Tetraaquadichlorochromium(III) nitrate

Option (B) is correct.

The correct I.U.P.A.C. name for $\left[Cr{Cl}_2{\left(H_{2}O\right)}_4\right]N{O}_3$ complex is tetraaquadichlorochromium(III) nitrate.

In this complex, water (aqua) is neutral ligand. $N{O}_3$ and $Cl$ has -1 charge. The oxidation state of chromium in this complex will be +3 . Oxidation state is written in roman letters within the brackets. Nitrate ion is present outside the sphere so it will be named after naming the complex.