Question

Which of the ligands can show linkage isomerism?
(a)- $CNS$
(b)- $N{{O}_{2}}$
(c)- $CN$
(d)- All of these

Answer 1

Ligands are those atoms or molecules that are attached to the central metal atom in the coordination complex. If a ligand has two donor atoms i.e., the same ligand can attach from two atoms can show linkage isomerism.

Complete step by step answer:
Ligands are associated with coordination complexes. Ligands are those atoms or molecules that are attached to the central metal atom in the coordination complex. The ligands are attached to the central metal atom by the coordinate bond.
Coordination compounds show isomerism in that they have a different arrangement of ligands around the central metal atom. If a ligand has two donor atoms i.e., the same ligand can attach from two atoms can show linkage isomerism.
So in $CNS$, there are two donor atoms or we can say that there are two atoms from which it can attach to the central metal atom, these are from C (carbon) and S (sulfur).
So in $N{{O}_{2}}$, there are two donor atoms or we can say that there are two atoms from which it can attach to the central metal atom, these are from N (nitrogen) and O (oxygen).
So in $CN$, there are two donor atoms or we can say that there are two atoms from which it can attach to the central metal atom, these are from C (carbon) and N (nitrogen).

Therefore, the correct answer is an option (d)- All of these.

Note: There are some other isomers that are shown by coordinate compounds, these are coordinate isomers are those in which the positive and negative ligands of the complex interchange, geometrical isomers are those in which the cis and trans-form can be written, etc.