Chemistry - Coordination Chemistry Question with Solution | TestHub

The magnetic moment of 5.92 B.M. indicates 5 unpaired electrons. Mn²⁺ is a $d^5$ ion. In a square planar geometry, $d^5$ complexes are typically low spin with 1 unpaired electron. Therefore, a square planar geometry for $[\mathrm{MnB}{\mathrm{r}}_4{]}^{2-}$ is unlikely.