MHT CET Chemistry question

From the stability constants (hypothetical values) given below, predict which one is the strongest ligand?

(A)
(B)\mathrm{Cu^{2+} + 4NH_3 \rightleftharpoons [Cu(NH_3)_4]^{2+},\ K = 4.5\times 10^{11}}
(C)\mathrm{Cu^{3+} + 4CN^- \rightleftharpoons [Cu(CN)_4]^{2-},\ K = 2.0\times 10^{27}}Correct
(D)\mathrm{Cu^{2+} + 2en \rightleftharpoons [Cu(en)_2]^{2+},\ K = 3.0\times 10^{15}}

Answer: (C)

Solution

A larger stability constant means a stronger metal-ligand binding, and for is the largest of the four

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Question ID VK-072977