Why trans Fe(en)2cl2 does not show optical isomers?

Optical isomerism is exhibited by only those complexes in which elements of symmetry are absent. Octahedral complexes of the types [M(aa)₃], [M(aa)x₂,y₂] and [M(aa)₂x₂] have an absence of elements of symmetry, thus exibit optical isomerism. Here, aa represents bidentate ligand, x or y represent mondentate ligand and M represent central metal ion.
Hence, [Co(NH₃)₃Cl₃]⁰ due to the presence of symmetry elements does not exhibit optical isomerism.
Optical isomerism is exhibited by only those ocmplexes in which elements of symmetry are absent. Octahedral complexes of the types [M(aa)3], [M(aa)x₂,y₂] and [M(aa)₂x₂] have an absence of elements of symmetry, thus exhibit optical isomerism. Here, aa represents bidentate ligand, x or y represent monodentate ligand and M represent central metal ion.
Hence, [Co(NH₃)₃Cl₃]⁰ due to the presence of symmetry elements does not exhibit optical isomerism.