Which one of the following coordination compounds will exhibit both geometrical and optical isomerism?

Step-by-step solution

The complex [ Cr ( ox )₃ ]³⁻ is a tris-chelated complex of the form M(AA)₃ . It exhibits optical isomerism but does not show geometrical isomerism because all donor atoms are identical. The complex [ Co ( CN )₆]³⁻ is an octahedral complex of the form MA₆ . It does not exhibit either geometrical or optical isomerism. The complex [ Co ( en )₂ Cl ₂ ]⁺ is of the form M(AA)₂ a₂ . The cis-isomer of this complex is optically active (chiral) and also exists as a geometrical isomer (cis and trans). The trans-isomer is optic