Question

$\left[Co{\left({NH}_3\right)}_4{Cl}_2\right]{NO}_2$ and $\left[Co{\left({NH}_3\right)}_{4}Cl{NO}_2\right]Cl$ exhibit which type isomerism?

• A. Geometrical
• B. Optical
• C. Linkage
• D. Ionisation

Answer 1

The correct option is D Ionisation

$\left[Co{\left({NH}_3\right)}_4{Cl}_2\right]{NO}_2$ and $\left[Co{\left({NH}_3\right)}_{4}Cl{NO}_2\right]Cl$ exhibit ionisation isomerism. There is an exchange of ions inside and outside the coordination sphere. Ionisation isomers have the same molecular formula but produce different ions in solution.

$\left[Co{\left({NH}_3\right)}_4{Cl}_2\right]{NO}_2\to {\left[Co{\left({NH}_3\right)}_4{Cl}_2\right]}^{+}+{NO}_2^{-}$

$\left[Co{\left({NH}_3\right)}_{4}Cl{NO}_2\right]Cl\to {\left[Co{\left({NH}_3\right)}_{4}Cl{NO}_2\right]}^{+}+C{l}^{-}$

This isomerism is also called ion exchange isomerism.