In which of the following compounds (s), the colour is due to the charge transfer spectra

Options

A. `KMnO_4`
B. `CrO_3`
C. `CuCl_2`
D. `Cu_2O`

Explanation

(A)In `MnO_4^-` , the valence shell electron configuration of Mn(VII) is `3d^0 4S^@0` and thus the colour of the compound is not due to d-d transition but is due to change transfer spectrum.
(B)In `CrO_3` , the valence shell electron configuration of Cr(VI) is `3d^0 4S^0` and thus the colour of the compound is not due to d-d transition but is due to change transfer spectrum.
(C )In `CuCl_2` , the valence shell electron configuration of Cu(II) is `3d^9 4S^0` and thus the colour of the compound is due to d-d transition but is due to change transfer spectrum.
(D)In `Cu_2O` , the valence shell electron configuration of Cu(I) is `3d^10 4S^0` and thus the colour of the compound is not due to d-d transition but is due to change transfer spectrum.