Question

geometrical isomerism??

Answer 1

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Geometric isomerism (also known as cis-trans isomerism or E-Z isomerism) is a form of stereoisomerism. This page explains what stereoisomers are and how you recognise the possibility of geometric isomers in a molecule.
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Answer 2

This type of isomerism arises in hetroleptic complexes due to the difference in geometrical arrangement of the ligand around the central metal ion. If the same kind of ligand occupy adjacent position, the isomer is called cis and if these are opposite to each other, the isomer is called trans