Jahn-Teller distortion effect observed in octahedral complexes of (In week filled legends):-

Question

TestHub · Accepted Answer

Jahn–Teller distortion in octahedral complexes is observed when there is asymmetric occupancy in $_{e_{g}}$ orbitals.

Check configurations:

d⁴ (high spin) → $t_{2 g}^{3} e_{g}^{1}$ → asymmetry in e $_{g}$

d⁹→ $t_{2 g}^{6} e_{g}^{3}$ → strong asymmetry

d⁷ (high spin)** → $t_{2 g}^{5} e_{g}^{2}$ → usually weak Jahn–Teller effect

d⁸ → $t_{2 g}^{6} e_{g}^{2}$ → symmetric, generally no effect

So the correct answer is: A, B, C

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