First slide

Crystal field theory

Question

Consider the following electronic arrangement for an octahedral complex.
The above arrangement can be observed in

Moderate

A

Mn³⁺…in presence of weak field ligand
B

Mn²⁺…in presence of strong field ligand
C

Fe³⁺…in presence of weak field ligand
D

Cr³⁺…in presence of strong field ligand

Solution

The configuration is $t_{2 g}^{3} e_{g}^{2}, (d^{5}),$ It is possible only in presence of weak field ligand $(∆_{o} < P)$
(1) and (4) have ${Mn}^{+ 3} (3 d^{4}) and {Cr}^{3 +} (3 d^{3})$ as central metal ions, they can be ignored.
Among (2) and (3) the correct option is (3).
In (2)… the configuration would be $t_{2 g}^{5}$

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