Correct increasing order for the wavelengths of absorption in the visible region by the complexes of `Co^(3+)` is:

Options

A. (a) `[Co(H_2O)_6]^(3+), [Co(en)_3]^(3+), [Co(NH_3)_6]^(3+)`
B. (b) `[Co(H_2O)_6]^(3+), [Co(NH_3)_6]^(3+), [Co(en)_3]^(3+)`
C. (c) `[Co(NH_3)_6]^(3+), [Co(en)_3]^(3+), [Co(H_2O)_6]^(3+)`
D. (d) `[Co(en)_3]^(3+), [Co(NH_3)_6]^(3+), [Co(H_2O)_6]^(3+)`

Answer

D

Explanation

`[epsilon_aprop1/lambda_a]` More is splitting, more energy, more frequency and less `lambda` of energy is absorbed
where `epsilon_aimplies` absorbed energy (splitting energy)
`lambda_aimplies` absorbed wavelength
Strength of ligand `prop` magnitude of splitting
Strength `engtNH_3gtH_2O` of ligand
Energy absorbed `engtNH_3gtH_2O` if ligand is
`lambda` absorbed as `enltNH_3ltH_2O`