Which of the following transition metal complexes exhibits optical isomerism due to the presence of three symmetrical bidentate ligands?

💡 Solution & Explanation

The tris(ethylenediamine)cobalt(III) ion forms an octahedral complex containing three chelate rings that lacks a plane of symmetry and a center of inversion, existing as non-superimposable mirror image enantiomers known as optical isomers. Complexes like square planar platinum derivatives exhibit geometrical cis-trans isomerism rather than optical activity due to molecular symmetry planes. Chiral coordination compounds can rotate the plane of polarized light in opposite directions.