Which complex in the following has the highest stability constant at 298 K ?

Options

A. `[Cdcl_(4)]^(2-)`
B. `(Cd(Br)_(4)]^(2-)`
C. `[CdI_(4)]^(2-)`
D. `[Cu(CN)_(4)]^(2-)`

Answer

D

Explanation

As `CN^(-)` is strongest ligand it will form the most stable complex.
Hence, (D) is the correct