Chemistry - Coordination Chemistry Question with Solution | TestHub

A π-acid ligand accepts electron density from the metal through back-bonding.

* Ferrocene (C₅H₅⁻): Cp ligand has vacant π* orbitals → π-interaction possible.

* Potassium ferrocyanide (CN⁻): CN⁻ is a strong π-acceptor ligand.

* Sodium nitroprusside (CN⁻, NO⁺): both CN⁻ and NO⁺ are π-acid ligands.

* Zeise's salt contains ethylene (C₂H₄), a classic π-acid ligand.

$$\boxed{Complexes1,2,3,4contain\pi -acidligand(s)}$$