In this question, we have to find the Crystal field stabilisation energy: cfse for high spin d4 octahedral complex is
As we know high spin is due to a weak ligand , hence pairing up of electrons does not take place.
in case of high spin complex, Δ0 is small. Thus, the energy required to pair up the fourth electron with the electrons of lower energy d-orbitals would be higher than that required to place the electrons in the higher d-orbital. Thus, pairing does not occur.
For high spin d4 octahedral complex Crystal field stabilisation energy
The following figure shows the filling of electrons in the subshells.
The correct option is A –0.6Δoct
therefore the answer to the question
CFSE for high spin d4 octahedral complex is___?