Q48 / 180 · AIIMS 2015 · Chemistry

Amongst the following, the most stable complex is

  • A
    $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
  • B
    $\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
  • Correct answer
    C
    $\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$
  • D
    $\left[\mathrm{FeCl}_6\right]^{3-}$

Solution

$\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ is the most stable complex due to chelate formation as $\mathrm{C}_2 \mathrm{O}_4^{2-}$ is a bidentate chelating ligand.

Hence, the correct answer is option: 'C'.

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