Arrange the following coordination complexes in the increasing order of the wavelength of light absorbed by them: A. [ Cr ( NH ₃ )₆ ]³⁺ B. [ Cr ( CN )₆ ]³⁻ C. [ Cr ( H ₂ O )₆ ]³⁺ D. [ CrCl ₆ ]³⁻ Choose the correct answer from the options given below:

Step-by-step solution

The wavelength of light absorbed by a coordination complex is inversely proportional to the crystal field splitting energy ( _o ) of the complex, since E = hc = _o . The magnitude of _o depends on the field strength of the ligands. According to the spectrochemical series, the increasing order of ligand field strength is: Cl ^- H ₂ O NH ₃ CN ^- Therefore, the order of crystal field splitting energy ( _o ) for the given complexes is: [ Cr ( CN )₆ ]³⁻ [ Cr ( NH ₃)₆ ]³⁺ [ Cr ( H ₂ O )₆ ]³⁺ [ CrCl ₆ ]³⁻ B A C D Since th