NEET Practice Questions (MCQs) with Answers & Solutions

${\mathrm{nCH}}_2=\underset{\mathrm{Cl}}{\underset{|}{\mathrm{CH}}}\to {\left(-{\mathrm{CH}}_2-\underset{\mathrm{Cl}}{\underset{|}{\mathrm{CH}}}-\right)}_{\mathrm{n}}$

This is polyvinyl chloride or PVC.

Perspex or plexiglass is ${\left[-\underset{{\mathrm{COOCH}}_3}{\overset{{\mathrm{CH}}_3}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}-{\mathrm{CH}}_2-\right]}_n$

a homopolymer of ${\mathrm{CH}}_3-\underset{{\mathrm{COOCH}}_3}{\underset{|}{\mathrm{C}}}={\mathrm{CH}}_2$,i.e., methyl methyl acrylate.

All are characteristics of gutta parcha rubber.

(a) Butyl rubber is a copolymer of isobutylene and isoprene.

(d) Condensation polymers are obtained by bifunctional molecules (monomers) with the elimination of smaller molecules whereas additional polymers are obtained from multiple bond containing monomers. Neoprene is a polymer of chloroprene(CH₂=C(Cl)-CH=CH₂) so it is an addition polymer, not a condensation polymer.

(d) DNA is natural biopolymer.

 Buna-S is a copolymer of 1,3-butadiene and styrene.

(a) Buna rubber is homopolymer of 1,3-butadiene.