Which of the following statements is incorrec | vedclass

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(C) $1$. Butyl rubber is a copolymer of isobutylene and a small amount of isoprene,and it is generally considered a linear or slightly branched elasto

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Dextron is a biodegradable polymer of the polyamide class.

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(C) $1$. Butyl rubber is a copolymer of isobutylene and a small amount of isoprene,and it is generally considered a linear or slightly branched elastomer.$2$. Dacron (also known as Terylene) is a copolymer formed by the condensation of ethylene glycol and terephthalic acid.$3$. Dextron (or Dextran) is a polysaccharide,not a polyamide. Polyamides are polymers containing amide linkages (e.g.,Nylon-$6$,$6$).$4$. Orlon is polyacrylonitrile,which is used as a substitute for wool in synthetic textiles.Therefore,the statement that Dextron is a biodegradable polyamide is incorrect.

Column-$I$	Column-$II$
$A$. Acrilan	$i$. $-[CH_2-CH(CN)]_n-$
$B$. Polystyrene	$ii$. $-[CH_2-CH(C_6H_5)]_n-$
$C$. Neoprene	$iii$. $-[CH_2-C(Cl)=CH-CH_2]_n-$
$D$. Novolac	$iv$. $-[CH_2-CH=CH-CH_2-CH_2-CH(CN)]_n-$
$E$. Buna-$N$	$v$. Linear phenol-formaldehyde polymer

Which of the following statements is incorrect?

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