In the complex [Co NH3 4Cl2]+, there are two types of isomerism present: geometrical isomerism and optical isomerism.1. Geometrical isomerism: This type of isomerism arises due to the different possible arrangements of ligands around the central metal ion. In this complex, there are two geometrical isomers: cis and trans.a Cis isomer: In the cis isomer, the two Cl- ligands are adjacent to each other in the octahedral arrangement. Cl |NH3-Co-NH3 | | NH3 NH3b Trans isomer: In the trans isomer, the two Cl- ligands are opposite to each other in the octahedral arrangement. NH3 Cl \ /Co---Co / \ NH3 Cl2. Optical isomerism: This type of isomerism occurs when a molecule has a non-superimposable mirror image. The cis isomer of [Co NH3 4Cl2]+ exhibits optical isomerism, as it has a pair of enantiomers non-superimposable mirror images .a -cis isomer left-handed : Cl |NH3-Co-NH3 | | NH3 NH3b -cis isomer right-handed : NH3 Cl \ /Co---Co / \ NH3 NH3In summary, the complex [Co NH3 4Cl2]+ exhibits geometrical isomerism cis and trans and optical isomerism -cis and -cis .