Which complex is most stable?
Where $k_d = \text{Dissociation constant}$

  • A
    $[Cu(CN)_2]^- ; k_d = 1 \times 10^{-16}$
  • B
    $[Fe(CN)_6]^{4-} ; k_d = 1 \times 10^{-37}$
  • C
    $[Fe(CN)_6]^{3-} ; k_d = 1 \times 10^{-44}$
  • D
    $[Ag(CN)_2]^- ; k_d = 1 \times 10^{-20}$

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