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AIIMS 2015
Exam
AIIMS
Year
2015
Subject
Chemistry
Chapter
Coordination Compounds

AIIMS 2015 · Chemistry · Coordination Compounds

Amongst the following, the most stable complex is

Amongst the following, the most stable complex is

Options

  1. A\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}
  2. B\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right]^{3+}
  3. C\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}
  4. D[FeCl6]3−\left[\mathrm{FeCl}_6\right]^{3-}

Correct answer

C. \left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}

Step-by-step 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 C2O42−\mathrm{C}_2 \mathrm{O}_4^{2-} is a bidentate chelating ligand.
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