Which of the following species correctly represent bidentate ligands capable of forming chelate ring — Coordination Compounds Chemistry Question

💡 Solution & Explanation

A bidentate ligand has two donor atoms that can simultaneously bind to the same central metal atom, forming a chelate ring. Oxalato (O,O donor), ethylenediamine (N,N donor), and glycinato (N,O donor) are classic bidentate ligands. Hydrazinium has only one available lone pair (the other is protonated) and cannot form a stable ring even if deprotonated to hydrazine due to steric strain, so it acts as a monodentate ligand.