NEETChemistryCoordination Compounds
Consider the following octahedral complexes of Ni ²⁺ : A: [ Ni ( H ₂ O )₆]²⁺ B: [ Ni ( NH ₃)₆]²⁺ C: [ Ni ( en )₃]²⁺ The correct increasing order of the wavelength of light absorbed by these complexes is:
Options
- AA < B < C
- BB < A < C
- CA < C < B
- DC < B < A
Correct answer
D. C < B < A
Step-by-step solution
According to the spectrochemical series, the increasing order of ligand field strength is H ₂ O The crystal field splitting energy ( _o ) increases with the field strength of the ligand. A stronger field ligand produces a larger _o . The energy of the absorbed light is directly proportional to _o and inversely proportional to the wavelength of the absorbed light ( E = hc ). Therefore, a stronger field ligand causes the absorption of light of higher energy and shorter wavelength. The increasing order of wavelength o