question_answer 44)

    The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, (a) (b)   (c)  (d)  

Answer:

                    (c) As we know that, strong field ligand split the five degenerate energy levels with more energy separation than weak field ligand, i.e., as strength of ligand increases crystal field splitting energy increases.     Hence,                 As energy separation increases, the wavelength decreases. Thus, the correct order is Here, strength of ligand increases,  increases, CFSE increases and  absorbed decreases. Hence, correct choice is (c).