The stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?
| 1. | \(Fe(CO)_5\) | 2. | \(\mathrm{Fe(CN)_{6}^{3-}}\) |
| 3. | \(\mathrm{Fe(C_{2}O_{4})_{3}^{3-}}\) | 4. | \(\mathrm{[Fe(H_{2}O)_{6}]^{3+}}\) |
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