A transition metal M forms 4 homoleptic octahedral coordination compounds, A, B, C and D of the type [MX6] ^ z- with monodentate ligands a , b , c and d respectively. These compounds absorb red, blue, yellow and blue-green light respectively. Which one of the options shows the correct order of decreasing ligand strength?

Step-by-step solution

The energy of the absorbed light is inversely proportional to the wavelength of the light absorbed, given by E = hc . The crystal field splitting energy _o is directly proportional to the energy of the absorbed light. Therefore, _o 1 . The wavelengths of the colors are approximately: Yellow (570-590 nm) The absorbed colors are given as: A (Red), B (Blue), C (Yellow), D (Blue-Green). The wavelengths follow the order: _ Red > _ Yellow > _ Blue-Green > _ Blue . Since _o is inversely proportional to , the order of _o (