Among `TiF_(6)^(2-), CoF_(6)^(3-), Cu_(2)C1_(2)` and `NiC1_(4)^(2-)` (At. No. `Ti = 22, Co = 27, Cu = 29, Ni = 28)`, the colourless species are -

Options

A. (a) `CoF_6^(3-)` and `NiCl_4^(2-)`
B. (b) `TiF_6^(2-)` and `CoF_6^(3-)`
C. (c) `Cu_2Cl_2` and `NiCl_4^(2-)`
D. (d) `TiF_6^(2-)` and `Cu_2Cl_2`

Answer

D

Explanation

`Ti^(4+): 3d^(0)` and `Cu^(+): 3d^(10)` cannot show d-d transition and thus colourless.