Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type and are
1. Linkage isomers
2. Coordination isomers
3. Ionization isomers
4. Geometrical isomers
e.g., NCS, NO etc.
Here, NCS has two binding sites at N and S,
Hence, NCS (thiocyanate) can bind to the metal ion in two ways
Thus, coordination compounds containing NCS as a ligand can show linkage
Hence, correct choice is (a).