Which is not true about metal carbonyls? — Coordination Compounds Chemistry Question

💡 Solution & Explanation

CO is called $\pi$-acid ligand. In metal carbonyl complexes, there is donation of an electron pair from carbon to the empty orbital of metal and then simultaneously a back $\pi$-bonding is formed by sideways overlap of a filled orbital on the metal with empty antibonding $\pi^*$ orbital of CO.