The correct order of the complexes [ Co ( NH_3)_5( H_2 O )]^3+( A ),[ Co ( NH_3)_6]^3+( B ),[ Co ( CN )_6]^3-( C ) and [ CoCl ( NH_3)_5]^2+ (D) in…

The correct order of the complexes $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}(\mathrm{A}),\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}(\mathrm{B}),\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}(\mathrm{C})$ and $\displaystyle \left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}$ (D) in terms of wavelength of light absorbed is