The stabilization of coordination compound due to chelation is called the chelate effect. Which of the following is the most stable complex species?

Options

A. `[Fe(CO)_(5)]`
B. `[Fe(CN)_(6)]^(3-)`
C. `[Fe(C_(2)O_(4))_(3)]^(3-)`
D. `[Fe(H_(2)O)_(6)]^(3+)`

Answer

C

Explanation

Chelation (formation of cycle by linkage between metal ion and ligand) stabilises the coordination compound. The ligand which chelates the metal ion are known as chelating ligand.
Here, only `[Fe(C_(2)O_(4))_(3)]^(3-)` is a coordination compound which contains oxalate ion as a chelating ligand. Hence, it stabilises coordination compound by chelating `Fe^(3+)` ion.