(1) Linkage and geometrical

The coordination compound exhibits both geometric isomerism and linkage isomerism.

Geometric Isomerism:

• In this type of isomerism, the spatial arrangement of ligands around the central metal atom is different. The most common form of geometric isomerism in coordination compounds is cis-trans isomerism. In the given complex, the chloride (Cl) and nitrite (NO2) ligands can be arranged in different ways, leading to cis and trans isomers. The cis isomer refers to a spatial arrangement where similar ligands are adjacent, while the trans isomer refers to a spatial arrangement where similar ligands are opposite each other.

Linkage Isomerism:

• Linkage isomerism arises when a ligand can coordinate to the central metal atom through different atoms. In the case of [Pt(Cl)2​(NO2​)2​], nitrite (NO2-) can coordinate to the platinum (Pt) through either the nitrogen atom or the oxygen atom. The isomers formed due to this difference in coordination are called linkage isomers.