Geomtrical isomerism is formed by [PtCl2Br2]²- .
Geometric isomers are two or more coordination compounds which contain the same number and types of atoms , and Bonds but which have different spatial arrangements of the atoms.
You can identify it by observing that there is restricted rotation about a bond. Restrict rotation involving a carbon-carbon double bond. There should be two different compounds on the left and right hand side of the double bond.
dibromodichloro Platinum (II) form the Geometrical Isomerism and there arrangement will be [M(A2B2] and the shape will be square planar
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