####4. The crystal field stabilisation energy (CFSE) of and , respectively, are
(2019 Main, 10 April II)
(a) and
(b) and
(c) and
(d) and
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Solution:
Key Idea Crystal field stabilisation energy (CFSE) for octahedral complexes
where, number of electrons occupying orbital.
number of electrons occupying orbital.
CFSE for tetrahedral complexes
where, number of electrons occupying orbital.
number of electrons occupying orbital.
In is a weak field ligand, so it is a high spin (outer orbital) octahedral complex of .
In is a weak field ligand, so it is a high spin tetrahedral complex of .
