Optical isomerism arises from the presence of

✅ Explanation:
Optical isomerism, also known as enantiomerism, occurs when a molecule has a chiral center, typically an asymmetric carbon atom. An asymmetric carbon atom is one that is bonded to four different groups. This arrangement leads to the existence of two non-superimposable mirror images of the molecule, known as enantiomers. These enantiomers rotate plane-polarized light in opposite directions, hence the term "optical isomerism."

🔑Key Points:
Optical isomerism occurs in complexes when the complex lacks a plane of symmetry, meaning its mirror images cannot be superimposed. This is often found in octahedral complexes with bidentate ligands, such as ethylenediamine (en), that create chirality within the structure.
-Bidentate Ligands: Ligands like ethylenediamine (en) form two bonds to the metal ion, often resulting in chiral complexes in octahedral geometry.
-Optical Activity: A complex that can exist in two non-superimposable mirror images is considered optically active and shows optical isomerism.