Given below are two statements: Statement-I: The M - C bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant d-orbital of the metal. Statement-II: The M - C bond is formed by the donation of a pair of electrons from a filled d-orbital of metal into the vacant antibonding ^* orbital of carbon monoxide. In the light of the above statements, choose the correct answer from the opti

Step-by-step solution

According to the bonding in metal carbonyls: Statement-I is incorrect because the M - C bond is formed by the donation of a lone pair of electrons from the carbonyl carbon into a vacant hybrid orbital of the metal, not necessarily a vacant d-orbital. For example, in Ni(CO) ₄ , the nickel atom is sp^3 hybridized ( 3d¹⁰ configuration) and the bonds are formed by donation into vacant sp^3 hybrid orbitals, with no vacant d-orbitals involved. Statement-II is correct because the M - C bond is formed by the back-donation