In the coordination compound [Co en 2Cl2]Cl, there are two types of isomerism present: geometrical isomerism and optical isomerism.1. Geometrical isomerism:There are two geometrical isomers for this compound: cis and trans.a Cis isomer: The two chloride Cl ligands are adjacent to each other.b Trans isomer: The two chloride Cl ligands are opposite to each other.2. Optical isomerism:Optical isomers are non-superimposable mirror images of each other. They are also called enantiomers. The cis isomer exhibits optical isomerism.a Cis-dextro : The cis isomer that rotates plane-polarized light to the right.b Cis-levo : The cis isomer that rotates plane-polarized light to the left.Here are the structures of each isomer:Cis isomer and enantiomers :`` H H H H \ / \ / N---Co---N N---Co---N / \ | / \ / \ | / \ H H Cl H H H H Cl H ``Trans isomer:`` H H H H \ / \ / N---Co---N N---Co---N / \ | / \ / \ | / \ H H Cl H H H H Cl H trans``Note that the trans isomer does not exhibit optical isomerism because it has a plane of symmetry.