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Which of the following represents a Ziegler–Natta catalyst system?

1. K[PtCl3(C2H4)]
2. (Ph3P)3RhCl
3. Al2(C2H5)6 + TiCl4
4. Fe(C5H5)2

Correct answer: Al2(C2H5)6 + TiCl4

Solution

The Ziegler–Natta catalyst system is characterized by the combination of a transition metal compound, such as titanium tetrachloride (TiCl4), with an organoaluminum compound, like diethylaluminum chloride (Al2(C2H5)6), which facilitates the polymerization of alkenes.

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