Question

Select the correct statement(s) about the complex $\left[Cr\right(N{O}_2\left)\right(N{H}_3{)}_5\left]\right[Zn\left(SCN{)}_4\right]$:

• A. It shows coordination isomerism
• B. It shows hydrate isomerism
• C. It shows linkage isomerism
• D. IUPAC name of the compound is Pentaaminenitrito-N-chromium(III) tetrathiocyanato-S-zincate(II)

Answer 1

Answer: (A), (C), (D)

IUPAC name of the compound is Pentaaminenitrito-N-chromium(III) tetrathiocyanato-S-zincate(II)

Linkage isomers arise when an ambidentate ligand can coordinate to a metal cation through either of the two different donor atoms.
In given complex both $-SCN$ and $-N{O}_2$ are ambidentate ligand so they will show linkage isomersm.

In complexes when the cation and anion both are complex ions, there may be exchange of ligands between these two complex ions resulting in coordination isomers.
Hence, given compound also shows coordination isomerism.

IUPAC name of given complex is Pentaaminenitrito-N-chromium(III) tetrathiocyanato-S-zincate(II).

There is no water molecule in the complex, hence, it does not show hydrate isomerism.

Hence, option (a), (c) and (d) are correct. (B) Is not possible because $A{s}^{3+}$ does not react with $K_4\left[Fe\right(CN{)}_6]$