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  4. Cis-trans isomerism is found in square planar complexes of the molecular formula (a and b are monodentate ligands):

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Q. Cis-trans isomerism is found in square planar complexes of the molecular formula ($a$ and $b$ are monodentate ligands):

Coordination Compounds

Solution:

For square planar complexes $Ma _{4}, Ma _{3} b$ or $Mab _{3}$ where $a$ and $b$ etc, are monodentate ligands, geometrical isomerism is not possible.
However, square planar complexes of the type
$Ma _{2} b _{2}, Ma _{2} bc , Mabcd$ and $M ( AA )_{2}, M ( AB )_{2}$ where $AA$ and $AB$ represent symmetrical and unsymmetrical chelating agents - do give geometrical isomers. $A$ few examples are given below.
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