Which of the following pairs of compounds shows coordination isomerism?

A $[Co (NH X_{3}) X_{6}] [Cr (CN) X_{6}]$ and $[Cr (NH X_{3}) X_{6}] [Co (CN) X_{6}]$
B $[Co (NH X_{3}) X_{5} Cl] SO X_{4}$ and $[Co (NH X_{3}) X_{5} (SO X_{4})] Cl$
C $[Cr (H X_{2} O) X_{6}] Cl X_{3}$ and $[Cr (H X_{2} O) X_{5} Cl] Cl X_{2} \cdot H X_{2} O$
D $[Co (NH X_{3}) X_{5} (NO X_{2})] Cl X_{2}$ and $[Co (NH X_{3}) X_{5} (ONO)] Cl X_{2}$

Answer: A

Coordination isomerism needs both cation and anion to be complex ions, with ligands exchanged between the two metal centres. Only the first pair fits. The second pair is ionisation isomerism, the third is hydrate isomerism and the fourth is linkage isomerism.

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