JEE Chemistry Polymers MCQs Set 03

Practice MCQs for JEE Chemistry Polymers

Access targeted multiple-choice questions for Polymers designed to align with the latest JEE academic syllabus for JEE Chemistry. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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View or download the dedicated Polymers MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.

Multiple Choice Questions

Question 1: Which one of the following is an example of a thermosetting polymer?
(a) Neoprene, \( \left[\mathrm{CH_2{-}C(Cl){=}CH{-}CH_2}\right]_n \)
(b) PVC, \( \left[\mathrm{CH_2{-}CHCl}\right]_n \)
(c) Nylon-6,6, \( \left[\mathrm{NH{-}(CH_2)_6{-}NH{-}CO{-}(CH_2)_4{-}CO}\right]_n \)
(d) The phenol-formaldehyde polymer in which hydroxy-substituted benzene rings are joined by \( \mathrm{{-}CH_2{-}} \) bridges (Bakelite type)
Show Answer & Explanation

Answer: (d) The phenol-formaldehyde polymer in which hydroxy-substituted benzene rings are joined by \( \mathrm{{-}CH_2{-}} \) bridges (Bakelite type)

Explanation:
1. Neoprene is an elastomer, PVC is a thermoplastic and nylon-6,6 is a fibre-forming polyamide
2. The phenol-formaldehyde polymer cross-links on heating to a hard infusible mass, so it is thermosetting. Answer: (d)

Teacher's Note:
1. Thermosetting polymers cannot be remoulded once set.
2. Bakelite is the standard example.

Question 2: Buna-N synthetic rubber is a copolymer of:
(a) chloroprene and butadiene
(b) butadiene and styrene
(c) acrylonitrile and butadiene
(d) acrylonitrile and chloroprene
Show Answer & Explanation

Answer: (c) acrylonitrile and butadiene

Explanation:
1. Buna-N is made from 1,3-butadiene (Bu) and acrylonitrile (N)
2. Chloroprene gives neoprene and styrene gives Buna-S. Answer: (c)

Teacher's Note:
1. Buna means butadiene and sodium; the letter N stands for nitrile.

Question 3: Which of the following structures represents the neoprene polymer?
(a) \( \left[\mathrm{CH(C_6H_5){-}CH_2}\right]_n \)
(b) \( \left[\mathrm{CH_2{-}C(Cl){=}CH{-}CH_2}\right]_n \)
(c) \( \left[\mathrm{CH_2{-}CH(CN)}\right]_n \)
(d) \( \left[\mathrm{CH_2{-}CHCl}\right]_n \)
Show Answer & Explanation

Answer: (b) \( \left[\mathrm{CH_2{-}C(Cl){=}CH{-}CH_2}\right]_n \)

Explanation:
1. Neoprene is polychloroprene, formed from 2-chlorobuta-1,3-diene
2. Its repeat unit is –CH₂–C(Cl)=CH–CH₂–. (a) is polystyrene, (c) is polyacrylonitrile and (d) is PVC. Answer: (b)

Teacher's Note:
1. Chloroprene keeps one double bond in each repeat unit.

Question 4: Which one of the following sets forms a biodegradable polymer?
(a) HO–CH₂–CH₂–OH and terephthalic acid (HOOC–C₆H₄–COOH)
(b) styrene and buta-1,3-diene
(c) CH₂=CH–CN and CH₂=CH–CH=CH₂
(d) H₂N–CH₂–COOH and H₂N–(CH₂)₅–COOH
Show Answer & Explanation

Answer: (d) H₂N–CH₂–COOH and H₂N–(CH₂)₅–COOH

Explanation:
1. Glycine and 6-aminohexanoic acid give nylon-2-nylon-6, a biodegradable polyamide
2. The other sets give Terylene, Buna-S and Buna-N, which are not biodegradable. Answer: (d)

Teacher's Note:
1. Polymers with groups that enzymes can hydrolyse are biodegradable.

Question 5: Which of the following statements is not correct?
(a) Caprolactam is the monomer of nylon-6
(b) Terylene is a polyester polymer
(c) Phenol formaldehyde resin is known as bakelite
(d) The monomer of natural rubber is butadiene
Show Answer & Explanation

Answer: (d) The monomer of natural rubber is butadiene

Explanation:
1. The monomer of natural rubber is isoprene (2-methylbuta-1,3-diene), not butadiene
2. The other three statements are correct. Answer: (d)

Teacher's Note:
1. Natural rubber is cis-1,4-polyisoprene.

Question 6: Given the polymers A = nylon-6,6, B = Buna-S and C = polythene, arrange them in increasing order of their intermolecular forces:
(a) B < C < A
(b) A < C < B
(c) C < B < A
(d) B < A < C
Show Answer & Explanation

Answer: (a) B < C < A

Explanation:
1. Elastomers such as Buna-S have the weakest forces
2. Thermoplastics such as polythene have intermediate van der Waals forces
3. Fibres such as nylon-6,6 have strong hydrogen bonding
4. Increasing order: Buna-S < polythene < nylon-6,6, that is B < C < A. Answer: (a)

Teacher's Note:
1. Elastomers have weak forces, thermoplastics intermediate and fibres strong.

Question 7: Which one of the following pairs is not correctly matched?
(a) Terylene — condensation polymer of terephthalic acid and ethylene glycol
(b) Teflon — thermally stable cross-linked polymer of phenol and formaldehyde
(c) Novolac — linear polymer of phenol and formaldehyde
(d) Synthetic rubber — a copolymer of butadiene and styrene
Show Answer & Explanation

Answer: (b) Teflon — thermally stable cross-linked polymer of phenol and formaldehyde

Explanation:
1. Teflon is the addition polymer of tetrafluoroethene, not a phenol-formaldehyde polymer
2. The cross-linked phenol-formaldehyde polymer is bakelite. Answer: (b)

Teacher's Note:
1. Teflon is PTFE.

Question 8: Of the following, which is a step-growth polymer?
(a) Bakelite
(b) Polyethylene
(c) Teflon
(d) PVC
Show Answer & Explanation

Answer: (a) Bakelite

Explanation:
1. Bakelite forms by condensation of phenol and formaldehyde, a step-growth process
2. Polyethylene, Teflon and PVC form by chain-growth addition. Answer: (a)

Teacher's Note:
1. Condensation polymers are step-growth polymers.

Question 9: Which of the following is a semisynthetic polymer?
(a) Silk
(b) Wood
(c) Rayon
(d) Natural rubber
Show Answer & Explanation

Answer: (c) Rayon

Explanation:
1. Rayon is made by chemically treating natural cellulose, so it is semisynthetic
2. Silk, wood and natural rubber are natural polymers. Answer: (c)

Teacher's Note:
1. Cellulose acetate and rayon are semisynthetic.

Question 10: The glyptal polymer is obtained from glycol by reacting with:
(a) malonic acid
(b) phthalic acid
(c) maleic acid
(d) acetic acid
Show Answer & Explanation

Answer: (b) phthalic acid

Explanation:
1. Glyptal is formed by condensation of ethylene glycol with phthalic acid. Answer: (b)

Teacher's Note:
1. Glyptal is used in paints and lacquers.

Question 11: Dacron is an example of:
(a) polyamide
(b) polypropylene
(c) polyurethane
(d) polyester
Show Answer & Explanation

Answer: (d) polyester

Explanation:
1. Dacron (Terylene) is made from ethylene glycol and terephthalic acid, joined by ester links, so it is a polyester. Answer: (d)

Teacher's Note:
1. Ester linkages mark polyesters.

Question 12: Nylon-6,6 is made by the polycondensation of:
(a) adipic acid and hexamethylenediamine
(b) phthalic acid and glycerol
(c) phenol and formaldehyde
(d) urea and formaldehyde
Show Answer & Explanation

Answer: (a) adipic acid and hexamethylenediamine

Explanation:
1. Nylon-6,6 forms from adipic acid (six carbons) and hexamethylenediamine (six carbons) with loss of water. Answer: (a)

Teacher's Note:
1. The two sixes in the name refer to the carbon counts of the two monomers.

Question 13: Formaldehyde is not used in the manufacture of the following polymer:
(a) Bakelite
(b) Nylon-6
(c) Urea resin
(d) Melamine resin
Show Answer & Explanation

Answer: (b) Nylon-6

Explanation:
1. Bakelite, urea-formaldehyde resin and melamine-formaldehyde resin all use formaldehyde
2. Nylon-6 is made from caprolactam. Answer: (b)

Teacher's Note:
1. Nylon-6 is a ring-opening polymer of caprolactam.

Question 14: PVC is formed by the polymerisation of:
(a) 1-chloroethene
(b) ethene
(c) propene
(d) 1-chloropropene
Show Answer & Explanation

Answer: (a) 1-chloroethene

Explanation:
1. PVC (polyvinyl chloride) is made by addition polymerisation of vinyl chloride, CH₂=CHCl, whose IUPAC name is chloroethene. Answer: (a)

Teacher's Note:
1. Vinyl chloride is chloroethene.

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