The d-electron configurations of Cr^2+, Mn^2+, Fe^2+ and Co^2+ are d^4, d^5, d^6 and d^7 respectively. Which one of the following will exhibit…

The d-electron configurations of $\displaystyle \mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}$, $\displaystyle \mathrm{Fe}^{2+}$ and $\displaystyle \mathrm{Co}^{2+}$ are $\displaystyle \mathrm{d}^4, \mathrm{~d}^5, \mathrm{~d}^6$ and $\displaystyle \mathrm{d}^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour ? (At. nos. $\displaystyle \mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ )