Easy
Arrange the orbitals of $H$-atom in the increasing order of their energy:
$3p_x, 2s, 4d_{xy}, 3s, 4p_z, 3p_y, 4s$
$3p_x, 2s, 4d_{xy}, 3s, 4p_z, 3p_y, 4s$
- A$2s < 3s < 3p_x = 3p_y < 4s < 4p_z < 4d_{xy}$
- B$2s < 3s = 3p_x = 3p_y < 4s = 4p_z = 4d_{xy}$
- C$2s < 3s = 3p_x = 3p_y < 4s = 4p_z = 4d_{xy}$
- D$2s < 3p_x = 3p_y < 3s < 4s = 4p_z < 4d_{xy}$
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