Which of the following ligands is a chelating ligand?

Solution

1. A chelating ligand is a polydentate ligand that forms a ring structure with the central metal atom.
2. Ammonia, cyanide, and water are monodentate ligands.
3. Ethylenediamine (${\text{NH}}_2{\text{CH}}_2{\text{CH}}_2{\text{NH}}_2$) is a bidentate ligand that coordinates through two nitrogen atoms.
4. Hence the answer is (B).