Home Chemistry Co-ordinatios Compounds JEE Main 2022 Octahedral complexes of copper (II) undergo …
Chemistry Co-ordinatios Compounds JEE Main 2022 Single Correct MCQ
Published on: August 13, 2026

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 )

A
[Cu(H 2 0) 6 ]SO 4
B
[Cu(en)(H 2 O) 4 ]SO 4
C
cis-[Cu(en) 2 Cl 2 ]
D
trans-[Cu(en) 2 Cl 2 ]

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Text Solution

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The correct answer is:
A

There is unsymmetric filling of e g subset of Cu +2 ion, while there is symmetrical distribution in t 2g set, if the complex has same ligand there will be equal repulsion which leads to symmetrical bond length along t 2g , but due to uneven filling of electron in e g subset, either octahedral will be elongated or compressed.

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