Consider the following metal complexes:
, , ,
The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

Question

Consider the following metal complexes:
, , , 
The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is  B.M. (Nearest integer)

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Strategy:
 The wavelength of absorbed light is inversely proportional to the crystal field splitting energy (). The shortest wavelength corresponds to the highest energy and largest , which implies the strongest field ligand.

Step 1: Compare ligand field strengths
The metal ion is  (or  in one case) in all complexes.
Ligand field strength: .
The complex with the strongest field ligand is , which will have the largest  and absorb the shortest wavelength.

Step 2: Calculate magnetic moment
 has

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