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Question:

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

CO

Ethylenediamine

CN⁻

NCS⁻

Solution:

µ=5.9BM ∴n(no. of unpaired e)=5
Cation MnII d⁵ configuration only possible for relatively weak ligand.
∴NCS⁻