The following complexes $\underset{\text{(A)}}{\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}}…

The following complexes $\underset{\text{(A)}}{\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}},\underset{\text{(B)}}{\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}},\underset{\text{(C)}}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}},\underset{\text{(D)}}{\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}}$ The correct order of A, B, C and D in terms of wavenumber of light absorbed is :
  1. C \( < \) D \( < \) A \( < \) B
  2. \(\mathrm{B} < \mathrm{C} < \mathrm{A} < \mathrm{D}\)
  3. A \( < \) C \( < \) B \( < \) D
  4. D \( < \) A \( < \) C \( < \) B

Solution

As ligand field increases, light of more energy is absorbed
Energy $\propto$ wave number $(\bar{v})$

Asked in: JEE Main 2024 (06 Apr Shift 1)

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