Q. The conditions and consequence that favours the $t_{2g}^{3}e_g^{1}$ configuration in a metal complex are
A) weak field ligand, low spin complex
B) weak field ligand, high spin complex
C) strong field ligand, high spin complex
D) strong field ligand, low spin complex
Explanation
[Solution by Dr. Abubacker] $t_{2g}^3e_g^1$ is the $d^4$ configuration in which an electron occupies the higher $e_g$ level before pairing in $t_{2g}$. That happens when $\Delta_o<P$, i.e. with a weak field ligand, giving a high spin complex. (The exponent on $t_{2g}$ is not legible in the PDF; the standard form of this question is $t_{2g}^3e_g^1$.) Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.