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(A) The crystal field splitting energy $(\Delta_{0})$ increases as the field strength of the ligand increases.The spectrochemical series order for the

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$[Co(CN)_6]^{3-}, [Co(NH_3)_6]^{3+}, [Co(NH_3)_5(H_2O)]^{3+}, [Co(NH_3)_5Cl]^{2+}$

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(A) The crystal field splitting energy $(\Delta_{0})$ increases as the field strength of the ligand increases.The spectrochemical series order for the given ligands is: $CN^{-} > NH_3 > H_2O > Cl^{-}$.Since the energy of the absorbed light is inversely proportional to the wavelength $(\lambda \propto \frac{1}{\Delta_{0}})$,a stronger ligand field results in a larger $\Delta_{0}$ and a shorter wavelength of absorption.Thus,the increasing order of wavelength is: $[Co(CN)_6]^{3-} < [Co(NH_3)_6]^{3+} < [Co(NH_3)_5(H_2O)]^{3+} < [Co(NH_3)_5Cl]^{2+}$.

Correct increasing order for the wavelength of absorption in the visible region for the complexes of $Co^{3+}$ is :

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