Which of the following complexes formed by Cu++ ions is most stable?
| 1. | Cu2+ + 4NH3 → [Cu(NH3)4]2+ logK = 11.6 |
| 2. | Cu2+ + 4CN- → [Cu(CN)4]2- logK = 27.3 |
| 3. | Cu2+ + 2en- → [Cu(en)2]2+ logK = 15 .4 |
| 4. | Cu2+ + 4H2O → [Cu(H2O)4]2+ logK = 8.9 |
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