(A) The polymerization of olefins (like ethylene or propylene) to produce high-density polyethylene or polypropylene is carried out using the $Ziegler

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(A) The polymerization of olefins (like ethylene or propylene) to produce high-density polyethylene or polypropylene is carried out using the $Ziegler-Natta$ catalyst. This catalyst is typically a mixture of a transition metal compound,such as $TiCl_4$,and an organometallic compound,such as $Al(C_2H_5)_3$ (triethylaluminium).