Question

The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is : 

(1) NCS^– 

(2) CN^– 

(3) ethylenediamine 

(4) CO

Answer 1

Correct option: (1) NCS^–

Explanation:

µ = 5.9 BM → 5 unpaired e^– 

Mn²⁺ –[Ar]3d⁵ configuration only possible with relatively weaker ligand. 

So NCS^– is the answer (1).