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Valence bond theory (VBT) -
-
Hybridisation -
sp3d2 - square bipyramidal or octahedral
d2sp3 - octahedral
sp3 - tetradedral
dsp2 - square planar
- wherein
sp3d2 - outer complex
d2sp3 - inner complex
sp3 -![[Ni(Cl)_{4}]^{2-}](https://learn.careers360.com/latex-image/?%5BNi%28Cl%29_%7B4%7D%5D%5E%7B2-%7D)
dsp2 -![[Pt(CN)_{4}]^{2-}](https://learn.careers360.com/latex-image/?%5BPt%28CN%29_%7B4%7D%5D%5E%7B2-%7D)
Crystal field splitting in octahedral complex -
- wherein
The correct increasing order:
Now, we are removing the ligands that are pretend along 2-direction & all the orbitals containg two component will have a gradual decrease in energy.
Therefore, Orbital splitting will be done as follows
Option 1)

Option 2)
Option 3)
Option 4)