The correct order of the complexes (A), (B), (C) and (D) in terms of wavelength of light absorbed is:

Question

The correct order of the complexes  (A),  (B),  (C) and  (D) in terms of wavelength of light absorbed is:

Canvas Classes · Accepted Answer

Strategy:
 The wavelength of absorbed light maps inversely to the energy splitting (), which is determined strictly from the comparative field strengths of the acting ligands.

Step 1: Rank the ligand field strength
From the spectrochemical series, the relevant ligands ranked weakest to strongest:
.

Step 2: Map to the complexes relative to the base 
- (C)  : Hexa-cyano generates the absolute strongest field. Largest energy  Shortest wavelength.
- (B)  : Hexa-ammine generates a strong, constant

More questions from Coordination Compounds