Geometrical isomerism what is geometrical isomerism

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Geometrical isomerism:- 

This type of isomerism arises in the coordination compound due to the spatial arrangements of ligands around the central metal atom ion . If the same kind of ligands occupy adjacent position to each other ; it is called a cis - isomer and if these are opposite to each other , it is called a trans isomer . This type of isomerism is also Know as cis - trans isomerism .such as isomerism is not possible for complex having coordination number ( tetrahedral complex ) 2 or 3 or 4 . 
In this complex , all the coordination position are adjacent to one another . However , cis - trans isomerism is very common for coordination number 4                ( square planar complex ) and coordination number 6 ( octahedral complex ) .
       A typical structure of square planar and octahedral are shown below .

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