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(D) Ethene undergoes addition polymerisation to form high density polythene in the presence of a catalyst such as triethylaluminium $(Al(C_2H_5)_3)$ a

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High density polythene

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(D) Ethene undergoes addition polymerisation to form high density polythene in the presence of a catalyst such as triethylaluminium $(Al(C_2H_5)_3)$ and titanium tetrachloride $(TiCl_4)$,which is known as the Ziegler-Natta catalyst.This process occurs at a temperature of $333 \ K$ to $343 \ K$ and under a pressure of $6-7 \ 	ext{atm}$.High density polythene consists of linear molecules and is closely packed,which results in high density and high melting point.

The polymer $X$ consists of linear molecules and is closely packed. It is prepared in the presence of triethylaluminium and titanium tetrachloride under low pressure. The polymer $X$ is -

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