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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–ethylenediamine; $H_{2} N - {CH}_{2} - {CH}_{2} - {NH}_{2})$

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$cis- [Cu (en)_{2} {Cl}_{2}]$

$trans- [Cu (en)_{2} {Cl}_{2}]$

$[Cu (en) {(H_{2} O)}_{4}] {SO}_{4}$

$[Cu {(H_{2} O)}_{6}] {SO}_{4}$

answer is A.

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Detailed Solution

The complexes in which the metal ion have a unsymmetrical eg or t_2g orbital shows Jahn-taller distortions. In the complex [Cu(H₂O)₆]²⁺ the configuration is t_2g6_eg3 i.e eg orbital is unsymmetrical and hence will show Jahn-Taller distortions.

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