Which can show linkage isomerism?

[C r (H_{2} O)_{5} C l] C l_{2}

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[C r (H_{2} O)_{6}] C l_{3}

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[C o (N H_{3})_{5} (C N)] C l_{2}

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[C o (N H_{3})_{5} S O_{4}] B r

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Solution

The correct option is D $[C o (N H_{3})_{5} (C N)] C l_{2}$
Linkage isomerism is the existence of coordination compounds having same composition but linkage or connectivity of central metal atom to ligand differs. Among all the options, Option C contains ambident neucleophile which is CN(Cyanide) as a ligand. It can show linkage isomerism as:
$[C o (N H_{3})_{5} (C N)] C l_{2}$ and $[C o (N H_{3})_{5} (N C)] C l_{2}$

In both cases, ligand CN is linked to central atom through two different atoms C and N.

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Similar questions

What kind of isomerism exists between $[C r (H_{2} O)_{6}] C l_{3} (v i o l e t)$ and $[C r (H_{2} O)_{5} C l] C l_{2} . H_{2} O (g r e y i s h - g r e e n)$ ?
(a) Linkage isomerism
(b) Solvate isomerism
(c) Ionisation isomerism
(d) Coordination isomerism