The magnetic moment of an octahedral homoleptic $\mathrm{Mn}$ (II) complex is $5.9 \mathrm{BM}$. The suitable ligand for this complex is :
$\mathrm{CN}^{-}$
$\mathrm{NCS}^{-}$
$\mathrm{CO}$
ethylenediamine
Correct Option: , 2
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