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JEE Main202229 Jul 2022Evening ShiftChemistryCoordination CompoundsActual

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; H 2 N - CH 2 - CH 2 - NH 2 )

Options

  1. ACu H 2 O 6 SO 4
  2. BCu en H 2 O 4 SO 4
  3. Ccis- Cu en 2 Cl 2
  4. Dtrans- Cu en 2 Cl 2

Correct answer

A. Cu H 2 O 6 SO 4

Step-by-step solution

According to John teller any nonlinear molecular system in a degenerate electronic state will be unstable and will undergo some kind of distortion which will lower its symmetry and energy and split the degenerate state. In case of octahedral d9 configuration, the last electron may occupy either dz 2 or dx 2 - y 2 orbitals of eg set. If it occupies dz 2 orbital most of the electron density will be concentrated between the metal and the two ligands on the z axis. Thus there will be greater electrostatic repulsion ass

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