JEE Advanced Chemistry question

Which one of the following is an example of coordination isomerism

(A)[Co(NH_3)_5Br]SO_4 and [Co(NH_3)_5SO_4]Br
(B)[Co(NH_3)_5NO_2]Cl_2 and [Co(NH_3)_5ONO]Cl_2
(C) and
(D)[Cr(NH_3)_6][Co(CN)_6] and [Co(NH_3)_6][Cr(CN)_6]Correct

Answer: (D)

Solution

Coordination isomerism occurs specifically when a compound contains BOTH a complex cation and a complex anion, and the distribution of ligands between the two metal centres differs between isomers. [Cr(NH_3)_6][Co(CN)_6] and [Co(NH_3)_6][Cr(CN)_6] are

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Question ID VK-160026