Among the following the coloured compound is

Options

A. `CuCI`
B. `K_(3)[Cu(CN)_(4)]`
C. `CuF_(2)`
D. `[Cu(CH_(3)CN)_(4)]BF_(4)`

Answer

c

Explanation

`CuFe_(2)` is blue coloured In `CuF_(2') Cu^(2+)` ions are present In all the other given options, the oxidation number of copper is `+1`
`Cu =3d^(10) 4s^(1),Cu^(o+)=3d^(10) 4s^(0)` (colourless)
`Cu^(2+) =3d^(9)` (coloured) one unpaired electrons is present .