Octahedral complexes of |Coordination Compounds|JEE-Main 2022

JEE MAIN 2022

29-07-2022 S2

Question

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; $\mathrm{H}_2 \mathrm{~N}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{NH}_2$ )

Select the correct option:

$\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{SO}_4$

$\mathrm{Cu}(\mathrm{en})\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{SO}_4$

cis- $\left[\mathrm{Cu}(\mathrm{en})_2 \mathrm{Cl}_2\right]$

$\operatorname{trans}-\left[\mathrm{Cu}(\mathrm{en})_2 \mathrm{Cl}_2\right]$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

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

Question Tags

JEE Main

Chemistry

Medium

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