Question

Write the geometrical isomers of the complex [PtBrCl(NH₃)₂].

Answer 1

1. The complex [PtBrCl(NH₃)₂] exhibits geometrical isomerism due to its square planar geometry and the different types of ligands attached to the central platinum ion.
2. In the cis-isomer, the two like ligands, the ammonia (NH₃) molecules, occupy adjacent positions (90° apart), while the halide ligands (Br⁻ and Cl⁻) are also adjacent.
3. This leads to the formation of the cis-form of the complex.
4. In contrast, in the trans-isomer, the two NH₃ ligands are positioned opposite each other (180° apart), as are the Br⁻ and Cl⁻ ligands.

Therefore, the complex [PtBrCl(NH₃)₂] exists in two geometrical isomers: the cis-isomer and the trans-isomer, each having a distinct arrangement of ligands around the platinum ion.