The electronic configuration with maximum exchange energy will be

3 d_{x y}^{1} 3 d_{y z}^{1} 3 d_{z x}^{1} 4 s^{1}

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3 d_{x y}^{1} 3 d_{y z}^{1} 3 d_{z x}^{1} 3 d_{x^{2} - y^{2}}^{1} 3 d_{z^{2}}^{2} 4 s^{2}

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3 d_{x y}^{2} 3 d_{y z}^{2} 3 d_{z x}^{2} 3 d_{x^{2} - y^{2}}^{2} 3 d_{z^{2}}^{1} 4 s^{1}

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3 d_{x y}^{2} 3 d_{y z}^{2} 3 d_{z x}^{2} 3 d_{x^{2} - y^{2}}^{2} 3 d_{z^{2}}^{2} 4 s^{1}

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Solution

The correct option is D $3 d_{x y}^{2} 3 d_{y z}^{2} 3 d_{z x}^{2} 3 d_{x^{2} - y^{2}}^{2} 3 d_{z^{2}}^{2} 4 s^{1}$
When two electrons with the same spin are present in the degenerate orbitals of a subshell. These electrons tend to exchange their positions and the energy released due to this exchange is called exchange energy.
The number of exchanges is maximium when the orbitals are half- filled or full- filled.

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