Discussion
Lanthanides and actinides are not known to form neutral carbonyl complexes because :
Answer: A
The keyed reason is They lack electrons in d orbitals.
Stable metal carbonyls depend on synergic bonding: CO donates a lone pair to the metal (σ) and the metal pushes d-electron density back into the empty π* orbitals of CO (π back-bonding). Without back-donation the M-CO bond is too weak to hold.
The lanthanides and actinides have their valence electrons in 4f and 5f orbitals, with few or no d electrons available, and the f orbitals are too contracted and buried to overlap with CO π*. So there is nothing to back-donate and neutral carbonyls are not formed under normal conditions. Their size is not the problem, and they do not hydrate CO.
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