Chemistry - Coordination Chemistry Question with Solution | TestHub

The $d$-electron configurations of ${\mathrm{Cr}}^{2+},{\mathrm{Mn}}^{2+},{\mathrm{Fe}}^{2+}$ and ${\mathrm{Co}}^{2+}$ are $d^4,d^5,d^6$ and $d^7$ respectively. Which one of the following will exhibit the lowest paramagnetic behaviour? (Atomic no. $\mathrm{Cr}=24,\mathrm{Mn}=25,\mathrm{Fe}=26,\mathrm{Co}=27$ ).