Which of the following statement(s) regarding the fundamental nature of ligands is/are correct? — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Ligands donate lone pairs to empty metal orbitals, thus acting as Lewis bases (A is correct). $NH_4^+$ has no unshared lone pair of electrons on nitrogen, so it cannot act as a ligand (B is correct). $CO$ is a non-classical ( $\pi$ -acid) ligand that acts as a $\sigma$ -donor and a $\pi$ -acceptor (synergic bonding) (C is incorrect). $dien$ is a tridentate ligand, not ambidentate (D is incorrect).