Ncert Exercises & Solutions

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.	\(\mathrm{Fe(C_{2}O_{3})_{3}^{3-}}\)	4.	\(\mathrm{[Fe(H_{2}O)_{6}]^{3+}}\)

Hint: Bidentate ligand can show chelating effect.

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

{[F e {(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.
Chelating ligands are generally bidentate.

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