Correct option (b) [Pd(PPh3)2(NCS)2] and [Pd(PPh3)2(SCN)2]
Explanation:
Linkage isomers are caused due to the presence of ambidentate ligands [Pd(PPh3)2(NCS)2] and [Pd(PPh3)2(SCN)2] are linkage isomers due to SCN, an ambidentate ligand.
Thus, SCN can linked to Pd by both N as well as S through their tone pairs.