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 = ethylenediamine)

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Strategy:
 The Jahn-Teller effect distorts non-linear molecular complexes lacking a completely symmetric ground state. Elongation occurs most prominently when weak field ligands lie on the active distortion axis.

Step 1: Principles of Jahn-Teller distortion
 is extremely prone to Jahn-Teller distortion due to its  configuration. The single vacancy in the  set driving the distortion strongly favors elongation along the z-axis (distorted octahedron).
Distortion acts physically on the metal-ligand

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