Discussion
Correct statement regarding the electronic transitions of f-block elements is :
Answer: D
The correct statement is that there is little coupling of electronic transitions with molecular vibrations.
The 4f orbitals of the lanthanides lie deep inside the atom, shielded by the filled 5s and 5p shells, so they interact only weakly with the ligands. The f-f transitions are therefore hardly affected by ligand vibrations, and their bands are sharp and line-like, almost like those of free ions.
That same shielding makes the other statements wrong. f-f bands are narrow, not broad. Mixing of f with d orbitals is small. And f-f transitions are Laporte forbidden, since they occur within one subshell, which is why the colours of lanthanide ions are pale.
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