Which of the following ligands is correctly matched with its denticity and the specific donor atoms involved in coordination?

Step-by-step solution

Ethane-1,2-diamine ( H₂N-CH₂-CH₂-NH₂ ) is a didentate ligand with two nitrogen donor atoms. Thiocyanate ion ( SCN^- ) is an ambidentate ligand (monodentate) that can coordinate through either sulfur or nitrogen. Oxalate ion ( C₂O₄²⁻ ) is a didentate ligand with two oxygen donor atoms. Nitrite ion ( NO₂^- ) is an ambidentate ligand (monodentate) that can coordinate through either nitrogen or oxygen. Therefore, the oxalate ion is correctly matched with its denticity and donor atoms. Answer: Oxalate ion : Didentate li