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(D) $Cu^{2+}$ has a $d^9$ electronic configuration,which leads to an unsymmetrical filling of the $e_g$ orbitals $(t_{2g}^6 e_g^3)$.This causes Jahn-T

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$trans-[Cu(en)_2Cl_2]$

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(D) $Cu^{2+}$ has a $d^9$ electronic configuration,which leads to an unsymmetrical filling of the $e_g$ orbitals $(t_{2g}^6 e_g^3)$.This causes Jahn-Teller distortion in octahedral complexes.The magnitude of structural distortion is directly proportional to the difference in the field strength of the ligands present in the coordination sphere.In $[Cu(en)_2Cl_2]$,the ligands are $en$ (a strong field ligand) and $Cl^-$ (a weak field ligand).Because $en$ and $Cl^-$ have the largest difference in their ligand field strengths compared to the other options,$[Cu(en)_2Cl_2]$ exhibits the maximum structural distortion.Specifically,for $trans-[Cu(en)_2Cl_2]$,the axial ligands $(Cl^-)$ are significantly different from the equatorial ligands $(en)$,leading to maximum elongation.

Octahedral complexes of copper $(II)$ undergo structural distortion (Jahn-Teller). Which one of the given copper $(II)$ complexes will show the maximum structural distortion?
($en = \text{ethylenediamine}$; $H_2N-CH_2-CH_2-NH_2$)

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Octahedral complexes of copper $(II)$ undergo structural distortion (Jahn-Teller). Which one of the given copper $(II)$ complexes will show the maximum structural distortion?($en = \text{ethylenediamine}$; $H_2N-CH_2-CH_2-NH_2$)