The stabilisation of coordination compounds

Question:

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?

(i) [Fe(CO)5]

(ii) [Fe(CN)6]3–

(iii) [Fe(C2O4)3]3–

(iv) [Fe(H2O)6]3+

Solution:

Option (iii) is the answer.

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