Wht will be the theoretical value of magnetic moment `(mu)` when `CN^(-)` ligands join `Fe^(3+)` ion to yield complex

Options

A. 2.83 BM
B. 3.87 BM
C. 5.92 BM
D. 1.73 BM

Answer

D

Explanation

Valence shell electronic configuration of

`CN^-` is a strong field ligand, so it forms low spin complexes after pairing of electrons within 3d level. Magnetic moment ` = sqrt(n(n+2)) B.M`
(where n = number of unpaired electrons)
` = sqrt(1(1+2)) BM = 1.73 BM`