Amongst the following, the most stable complex is

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Amongst the following, the most stable complex is

ChemistryCoordination CompoundsAIIMSAIIMS 2015

Options:

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

Solution:

1312 Upvotes Verified Answer

The correct answer is: $\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$

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

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