Which of the following statement is correct about Ziegler-Natta Catalyst?

Options

A. Ziegler-Natta catalyst is a coordination polymerization catalyst
B. The polymers of alkeners obtained by using Ziegler -Natta catalyst are linear and have practically no chain branching
C. The polymerization of alkenes using Ziegler-Natta catalyst, syndiotactic controlled and either of the isotacidic, syndiotactic or atactic forms can be produced depending on the systems used
D. All of these

Answer

D

Explanation

A major problem that the polymer industry faced in the beginning was how to selectively synthesize either the isotactic of syndiotactic polymer without having it contaminted by other products.
The answer came Guilio - Natta and Karl Ziegler who demonstrated that certan catalysis, including triethylaluminum `[Al(C_(2) H_(5))_(3)]` and titanium trichloride `(TiCl_(3))`, promote the formation only of specific isomers. Hence they are called stereospecific catalysts. Their work opened up almost limitless possibilities for chemists to design polymers to suit any purpose.