In the complex `[Fe(H_(2)O)_(6)]^(3+)` `[Fe(CN)_(6)]^(3-)` `[Fe(C_(2)O_(4))_(3)]^(3-)` and `[FeCl_(6)]^(3-)`, that complex that has highest stability is

Options

A. `[Fe(H_(2)O)_(6)]^(3+)`
B. `[Fe(CN)_(6)]^(3-)`
C. `[Fe(C_(2)O_(4))_(3)]^(3-)`
D. `[FeCl_(6)]^(3-)`

Answer

C

Explanation

The central metal ion in all complexes is `Fe^(3+)`. `C_(2)O_(4)^(2-)` a negative bidentate ligand will form more stble complex than monodentate neutral or negative ligands.