Which of the following compounds exhibits optical isomerism due to the absence of a plane of symmetry and center of symmetry?

💡 Solution & Explanation

The cis isomer of the coordination complex [Co(Cl)2(en)2]+ lacks both a plane of symmetry and a center of symmetry, allowing it to rotate plane-polarized light and exhibit optical isomerism. Conversely, the trans isomer possesses a center of inversion, which prevents chiral behavior and makes it optically inactive. Bidentate ethylenediamine ligands frequently create chiral cis configurations in octahedral metal complexes.