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Question: Identify the primary function of Wilkinson's catalyst in organic synthesis, and state the specific components that make up a classic Ziegler-Natta catalyst system used for polymerization. Step 1: Recall the definition and formula of Wilkinson's catalyst. It is RhCl(PPh3)3, containing a rhodium metal center. Step 2: Determine its action. Its main application is the homogeneous catalytic hydrogenation of alkenes to alkanes under mild conditions. Step 3: Recall the composition of a standard Ziegler-Natta catalyst. It is a combination of a transition metal halide, specifically titanium tetrachloride (TiCl4), and an organoaluminium compound, specifically triethylaluminium (Al(C2H5)3). Step 4: Combine these facts to state their catalytic roles: Wilkinson's catalyst hydrogenates double bonds, while Ziegler-Natta polymerizes alkenes into high-density plastics.