Chemistry - Coordination Chemistry Question with Solution | TestHub

Significant Jahn-Teller distortion occurs only when there is an asymmetrical electronic configuration in the $e_g$ orbitals.

Low-spin $d^4$ ($t_{2g}{}^4{e}_g{}^0$) and high-spin $d^7$ ($t_{2g}{}^5{e}_g{}^2$) configurations both have symmetrically filled $e_g$ subshells.

Since the asymmetry lies entirely in their $t_{2g}$ subshells, they show only weak/minor distortion instead of significant distortion.

Therefore, statement (A) is false, making it the correct choice for this incorrect-option question.