Based on the stability constant (hypothetical values),which of the following is the strongest ligand?

  • A
    $Cu^{2+} + 4NH_3 \rightleftharpoons [Cu(NH_3)_4]^{2+}, (K = 4.5 \times 10^{11})$
  • B
    $Cu^{2+} + 4CN^{-} \rightleftharpoons [Cu(CN)_4]^{2-}, (K = 2.0 \times 10^{27})$
  • C
    $Cu^{2+} + 2en \rightleftharpoons [Cu(en)_2]^{2+}, (K = 3.0 \times 10^{15})$
  • D
    $Cu^{2+} + 4H_2O \rightleftharpoons [Cu(H_2O)_4]^{2+}, (K = 9.5 \times 10^8)$

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