Question

The d-electron configuration of $\left[\mathrm{Ru}{\left(\mathrm{en}\right)}_3\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ respectively are:

• A. ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2\mathrm{and}\mathit{}{\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0$
• B. ${\mathrm{t}}_{\mathit{2}\mathit{}g}^{\mathit{6}}{\mathrm{e}}_{\mathrm{g}}^0\mathrm{and}\mathit{}{\mathrm{t}}_{\mathit{2}\mathit{}g}^{\mathit{6}}{\mathrm{e}}_g^{\mathit{0}}$
• C. ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2\mathrm{and}{\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$
• D. ${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0\mathrm{and}\mathit{}{\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$

Answer 1

The correct option is D

${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0\mathrm{and}\mathit{}{\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$

Explanation of the correct option:

The correct answer is option D:

The orbital diagram can be shown below:

Explanation of the incorrect options:

Options A, B, and C:

1. By the above orbital diagrams, it can be seen that the electronic configurations of $\left[\mathrm{Ru}{\left(\mathrm{en}\right)}_3\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ are $t^6{{}_{2g}e}^0\text{and}{t}^4{{}_{2g}e}^2$ respectively.
2. Thus, options A, B, and C are incorrect.

Hence, option D is correct.
The d-electron configuration of $\left[\mathrm{Ru}{\left(\mathrm{en}\right)}_3\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ respectively are ${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0\mathrm{and}\mathit{}{\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$.