Observe the following complex ions Identify the option in which the unpaired electrons in the complex ions are in correct increasing order
Show Hint
The key to determining the number of unpaired electrons in an octahedral complex is the Spectrochemical Series, which dictates whether the complex is High Spin (Weak Field Ligand, small $\Delta_o$, electrons go to $e_g$) or Low Spin (Strong Field Ligand, large $\Delta_o$, electrons pair up in $t_{2g}$).
