Which among the following statements is NOT t | vedclass

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(B) High density polythene $(HDP)$ is obtained by the polymerization of ethene in the presence of a Zieglar-Natta catalyst at a temperature of $333 \

Vedclass · Accepted Answer

It needs high pressure $(1000-2000 \ atm)$ for synthesis.

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(B) High density polythene $(HDP)$ is obtained by the polymerization of ethene in the presence of a Zieglar-Natta catalyst at a temperature of $333 \ K$ to $343 \ K$ and a pressure of $6-7 \ atm$. Low density polythene $(LDP)$ requires high pressure $(1000-2000 \ atm)$. Therefore,the statement that $HDP$ needs high pressure is incorrect. Its melting point (in the range of $144-150^{\circ}C$) is higher than that of $LDP$ (melting point $110^{\circ}C$).

column-$I$	column-$II$
$A$. High density polythene	$i$. Isoprene
$B$. Neoprene	$ii$. Tetrafluoroethene
$C$. Natural rubber	$iii$. Chloroprene
$D$. Teflon	$iv$. Acrylonitrile
$E$. Acrilan	$v$. Ethene

Which among the following statements is $NOT$ true about high density polythene?

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column-$I$ column-$II$

$A$. High density polythene $i$. Isoprene

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