Which of the following complexes formed by `Cu^(2+)` ions is most stable ?

Options

A. `Cu^(2+) + 4NH_(3) hArr [Cu(NH_(3))_(4)]^(2+) , log K = 11.6`
B. `Cu^(2+) + 4 CN^(-) hArr [Cu(CN)_(4)]^(2-) , log K = 27.3`
C. `Cu^(2+) + 2 en hArr [Cu(en)_(2) ]^(2+) , log K = 15.4 `
D. `Cu^(2+) + 4H_(2)O hArr [Cu(H_(2)O)_(4)]^(2+) , log K = 8.9`

Answer

B

Explanation

Higher the value of stability constant K , greater is the stability .