The coordination compound [Co en 3]Cl3 exhibits both geometrical and optical isomerism. Geometrical isomerism:In this compound, geometrical isomerism is due to the different possible arrangements of the ethylenediamine en ligands around the central cobalt Co atom. There are two possible geometrical isomers: fac-isomer and mer-isomer.1. fac-isomer: In the fac-isomer, the three ethylenediamine ligands are arranged in a facial manner, occupying three adjacent vertices of an octahedron around the central cobalt atom.2. mer-isomer: In the mer-isomer, the three ethylenediamine ligands are arranged in a meridional manner, occupying three vertices of an octahedron in a 180 plane around the central cobalt atom.Optical isomerism:Optical isomerism occurs due to the presence of non-superimposable mirror images enantiomers of the complex. The [Co en 3]3+ complex has three bidentate ethylenediamine ligands, which can form chiral centers around the cobalt atom. Therefore, there are two possible optical isomers enantiomers for each geometrical isomer:1. fac-isomer: -fac and -fac enantiomers2. mer-isomer: -mer and -mer enantiomersIn summary, the coordination compound [Co en 3]Cl3 exhibits four different isomers: two geometrical isomers fac and mer and two optical isomers and for each geometrical isomer.