Which of the following ligands is a hexadentate ligand that coordinates to a central metal ion through four oxygen and two nitrogen donor atoms?

Step-by-step solution

Ethylenediaminetetraacetate ion ( EDTA⁴⁻ ) is an important hexadentate ligand. It can bind through two nitrogen and four oxygen atoms to a central metal ion. Ethane-1,2-diamine is a bidentate ligand with two nitrogen donor atoms. Oxalate ion is a bidentate ligand with two oxygen donor atoms. Diethylenetriamine is a tridentate ligand with three nitrogen donor atoms. Answer: Ethylenediaminetetraacetate ion