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From the stability constant (hypothetical values), given below, predict which is the most stable complex?
(A) \( \mathrm{Cu}^{2+}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}, \quad \mathrm{K}=4.5 \times 10^{11} \)
(B) \( \mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}, \quad \mathrm{K}=2.0 \times 10^{27} \)
\( \begin{array}{ll}\text { (C) } \mathrm{Cu}^{2+}+2 \mathrm{en} \longrightarrow\left[\mathrm{Cu}(\mathrm{en})_{2}\right]^{2+}, & \mathrm{K}=3.0 \times 10^{15} \\ \text { (D) } \mathrm{Cu}^{2+}+4 \mathrm{H}_{2} \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}, & \mathrm{K}=9.5 \times 10^{8}\end{array} \)
\( \mathrm{P} \)
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