Which one of the following metal complexes is most stable ?
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JEE Main 2021
A
[Co(en)2(NH3)2]Cl2
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B
[Co(en)3]Cl2
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C
[Co(en)(NH3)4]Cl2
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D
[Co(NH3)6]Cl2
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Solution
The correct option is B[Co(en)3]Cl2 Cyclic complexes, called chelates, are generally more stable than open chain complexes. Chelates having more number of cyclic rings are more stable than those having less number of cyclic rings. ∴ Of the given complexes [Co(en)3]Cl2 is most stable.