Question

$\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]N{O}_2$ and $\left[Co{\left(N{H}_3\right)}_{4}ClN{O}_2\right]Cl$ are:

• A. Geometrical isomers
• B. Optical isomers
• C. Linkage isomers
• D. Ionization isomers

Answer 1

The correct option is D Ionization isomers

Ionization isomers are identical except for a ligand which exchanges places with an anion or neutral molecule that was originally outside the coordination complex.

The central ion and the other ligands are identical. Here, one isomer is $\left[Co\right(N{H}_3{)}_{4}C{l}_2]N{O}_2,$ where $N{O}_2^{-}$ ion is outside the complex and other isomer is $\left[Co\right(N{H}_3{)}_{4}ClN{O}_2]Cl$, where $C{l}^{-}$ ion is outside the complex.

Both of these have the same molecular formula. So, these are ionization isomers.