Which of the following complexes is more stable and why ? `[Co(en)_3]^

1.	Which of the following complexes is more stable and why ? `[Co(en)_3]^(3+)` and `[Co(NH_3)_6]^(3+)`
Answer» Chelating ligands from more stable complexes complexes compared to non-chelating ligands. Since ethylene diammine is a bidentate ligand and froms stable chelate, `[Co(en)_(3)]^(3+)`

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(i) Arrange the following compounds in an increasing order of basic strength : `C_(6)H_(5)NH_(2), C_(6)H_(5)N(CN_(3))_(2), (C_(2)H_(5))_(2)NH and CH_(3)NH_(2)` (ii) Arrange the following compounds in a decreasing order of `pK_(b)` values: `C_(2)H_(5)NH_(2), C_(6)H_(5)NHCH_(3), (C_(2)H_(5))_(2) NH and C_(6)H_(5)NH_(2)`
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Which of the following complexes is more stable and why ? `[Co(en)_3]^(3+)` and `[Co(NH_3)_6]^(3+)`

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