(D) High density polythene (or plastic) is prepared by heating ethylene at about $330-350 \ K$,under a pressure of $1-2 \ atm$ and in the presence of

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Preparation of high density plastic

(D) High density polythene (or plastic) is prepared by heating ethylene at about $330-350 \ K$,under a pressure of $1-2 \ atm$ and in the presence of Ziegler-Natta catalyst.$n \ CH_2=CH_2 \xrightarrow[\text{Ziegler-Natta catalyst}]{330-350 \ K, 1-2 \ atm} (-CH_2-CH_2-)_n$High density polythene.