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JEEChemistry

Polymers

6 JEE Chemistry previous year questions on Polymers — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
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Among the following, the correct statement(s) about polymers is/are: [JEE Advanced 2022, Paper-2]
aThe polymerization of chloroprene gives natural rubber.
bTeflon is prepared from tetrafluoroethene by heating it with a persulphate catalyst at high pressures.
cPVC are thermoplastic polymers.
dEthene at 350-570 K temperature and 1000-2000 atm pressure in the presence of a peroxide initiator yields high-density polythene.
✓ Correct answer: b) Teflon is prepared from tetrafluoroethene by heating it with a persulphate catalyst at high pressures.
ExplanationThe correct statements about polymers are B and C. A. The polymerization of chloroprene gives natural rubber.This statement is incorrect.Natural rubber is a polymer of isoprene (2- methyl-1,3-butadiene).The polymerization of chloroprene (2- chloro-1,3-butadiene) yields neoprene, which is a synthetic rubber.B. Teflon is prepared from tetrafluoroethene by heating it with a persulphate catalyst at high pressures.This statement is correct.Teflon (polytetrafluoroethylene) is indeed manufactured by the polymerization of tetrafluoroethene (CF2C ) using a free radical initiator, such as a persulphate catalyst (e.g., ammonium persulphate), under high pressure.C. PVC are thermoplastic polymers.This statement is correct.Polyvinyl chloride (PVC) is a thermoplastic polymer, meaning it can be softened upon heating and hardened upon cooling repeatedly without significant chemical
Q2
PYQ

Melamine plastic crockery is a copolymer of:

a

HCHO and melamine

b

HCHO and ethylene

c

melamine and ethylene

d

None of these

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Q3
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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-

[JEE Main 2023, 11 Apr (Shift 1)]

a

Polyacrylonitrile

b

Low density polythene

c

Polytetrafluoroethane

d

High density polythene

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Q4
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In polymer Buna-S; \( S \) stands for:

[JEE Main 2021, 24 Feb (Shift 2)]

a

Styrene

b

Sulphur

c

Strength

d

Sulphonation

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Q5
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Monomer of Novolac is:

[JEE Main 2021, 31 Aug (Shift 1)]

a

3-Hydroxybutanoic acid

b

Phenol and melamine

c

o-Hydroxymethylphenol

d

1,3-Butadiene and styrene

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Q6
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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

[JEE Main 2023, 11 Apr (Shift 1)]

a

Polyacrylonitrile

b

Low density polythene

c

Polytetrafluoroethane

d

High density polythene

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