Type of isomerism which exists between [Pd(C₆H₅),(SCN)₂] and [Pd(C₆H₅),(NCS)₂] is:

CONCEPT:

Linkage Isomerism

• Linkage isomerism occurs when a particular ligand can coordinate to the central metal atom or ion through two or more different atoms.
• This type of isomerism is possible when a ligand has more than one donor atom but coordinates through only one donor atom at a time.
• The classic example involves the thiocyanate ligand (SCN^-), which can bond through either the sulfur atom or the nitrogen atom to the metal center.

EXPLANATION:

• In the given complexes:

  [Pd(C₆H₅)(SCN)₂] and [Pd(C₆H₅)(NCS)₂]

• The ligand SCN^- can attach to the palladium (Pd) center through either the sulfur atom (S) or the nitrogen atom (N).
• In [Pd(C₆H₅)(SCN)₂], the thiocyanate ligand is bonded through the sulfur atom.
• In [Pd(C₆H₅)(NCS)₂], the thiocyanate ligand is bonded through the nitrogen atom.

Therefore, the type of isomerism which exists between [Pd(C₆H₅)(SCN)₂] and [Pd(C₆H₅)(NCS)₂] is linkage isomerism.