JEE Chemistry Polymers MCQs Set 15

Multiple Choice Questions (MCQs) for JEE Chemistry: Polymers

Review structured MCQ sets for JEE Chemistry Polymers. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Practice Polymers MCQs for JEE Chemistry

Access the complete set of multiple-choice questions for Polymers below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official JEE textbooks.

Multiple Choice Questions

Question 1: Which of the following is a condensation polymer?
(a) Nylon-6,6
(b) Neoprene
(c) Teflon
(d) Buna-S
Show Answer & Explanation

Answer: (a) Nylon-6,6

Explanation:
1. Nylon-6,6 is formed from adipic acid and hexamethylenediamine with loss of water.
2. Neoprene, Teflon and Buna-S are formed by addition polymerisation.

Teacher's Note:
1. Condensation polymers are formed with elimination of small molecules such as H₂O.

Question 2: Which of the following is a thermosetting polymer?
(a) Bakelite
(b) Buna-N
(c) Nylon-6
(d) PVC
Show Answer & Explanation

Answer: (a) Bakelite

Explanation:
1. Bakelite is a heavily cross-linked polymer that sets on heating and cannot be remoulded.
2. Buna-N and PVC are elastomer/thermoplastic addition polymers and nylon-6 is a thermoplastic.

Teacher's Note:
1. Thermosetting polymers are cross-linked and infusible once set.

Question 3: Polymerisation of 4-hydroxybutanoic acid, HO–(CH₂)₃–COOH, gives a homopolymer whose repeating unit is:
(a) –[CO–(CH₂)₃–O]–
(b) –[O–(CH₂)₄–O]–
(c) –[CO–(CH₂)₄–CO]–
(d) –[NH–(CH₂)₃–CO]–
Show Answer & Explanation

Answer: (a) –[CO–(CH₂)₃–O]–

Explanation:
1. The acid contains both –OH and –COOH, so its molecules condense with loss of water to form ester links.
2. Each unit therefore retains one C=O and one O, giving –[CO–(CH₂)₃–O]–, a polyester.

Teacher's Note:
1. A hydroxy acid forms a polyester by self-condensation.

Question 4: The two monomers for the synthesis of nylon-6,6 are:
(a) HOOC(CH₂)₄COOH and H₂N(CH₂)₄NH₂
(b) HOOC(CH₂)₆COOH and H₂N(CH₂)₄NH₂
(c) HOOC(CH₂)₄COOH and H₂N(CH₂)₆NH₂
(d) HOOC(CH₂)₆COOH and H₂N(CH₂)₆NH₂
Show Answer & Explanation

Answer: (c) HOOC(CH₂)₄COOH and H₂N(CH₂)₆NH₂

Explanation:
1. The numbers 6,6 mean that both monomers contain six carbon atoms.
2. Adipic acid, HOOC(CH₂)₄COOH, has 6 C and hexamethylenediamine, H₂N(CH₂)₆NH₂, has 6 C.

Teacher's Note:
1. Nylon-6,6 = adipic acid + hexamethylenediamine.

Question 5: Which of the following statements about low density polythene is false?
(a) It is a poor conductor of electricity
(b) Its synthesis requires dioxygen or a peroxide initiator as a catalyst
(c) It is used in the manufacture of buckets, dustbins etc.
(d) Its synthesis requires high pressure
Show Answer & Explanation

Answer: (c) It is used in the manufacture of buckets, dustbins etc.

Explanation:
1. LDPE is made by free-radical polymerisation of ethene at high pressure (about 1000-2000 atm) and 350-570 K with a peroxide or oxygen initiator.
2. Rigid articles such as buckets and dustbins are made from high density polythene, not LDPE.

Teacher's Note:
1. LDPE is flexible and used for films and bags; HDPE is rigid.

Question 6: Which polymer is used in the manufacture of paints and lacquers?
(a) Bakelite
(b) Glyptal
(c) Polypropene
(d) Polyvinyl chloride
Show Answer & Explanation

Answer: (b) Glyptal

Explanation:
1. Glyptal, a polyester of ethylene glycol and phthalic acid, is used in paints and lacquers.
2. Bakelite is used for electrical fittings, polypropene for packaging and textiles, and PVC for raincoats and pipes.

Teacher's Note:
1. Glyptal = paints and lacquers.

Question 7: Which one is classified as a condensation polymer?
(a) Dacron
(b) Neoprene
(c) Teflon
(d) Acrylonitrile
Show Answer & Explanation

Answer: (a) Dacron

Explanation:
1. Dacron (terylene) is formed from ethylene glycol and terephthalic acid or its dimethyl ester with loss of water or methanol.
2. Neoprene and Teflon are addition polymers; acrylonitrile is a monomer.

Teacher's Note:
1. Polyesters and polyamides are condensation polymers.

Question 8: The species which can best serve as an initiator for cationic polymerisation is:
(a) LiAlH₄
(b) HNO₃
(c) AlCl₃
(d) BuLi
Show Answer & Explanation

Answer: (c) AlCl₃

Explanation:
1. Cationic polymerisation is started by an electrophile, such as a Lewis acid.
2. AlCl₃ (with a trace of water) is a strong Lewis acid; BuLi starts anionic polymerisation and LiAlH₄ and HNO₃ are not initiators.

Teacher's Note:
1. Lewis acids start cationic polymerisation; strong bases start anionic polymerisation.

Question 9: The thermosetting polymer bakelite is formed by the reaction of phenol with:
(a) CH₃CH₂CHO
(b) CH₃CHO
(c) HCHO
(d) HCOOH
Show Answer & Explanation

Answer: (c) HCHO

Explanation:
1. Phenol condenses with methanal (formaldehyde) at the o- and p-positions.
2. Repeated condensation gives the cross-linked polymer bakelite.

Teacher's Note:
1. Bakelite = phenol + HCHO.

Question 10: The polymer containing strong intermolecular forces, e.g. hydrogen bonding, is:
(a) Teflon
(b) Nylon-6,6
(c) Polystyrene
(d) Natural rubber
Show Answer & Explanation

Answer: (b) Nylon-6,6

Explanation:
1. Nylon-6,6 contains amide (–CO–NH–) groups.
2. Hydrogen bonds form between the C=O and N–H groups of neighbouring chains.

Teacher's Note:
1. Polyamides are fibres because of inter-chain hydrogen bonding.

Question 11: Buna-N synthetic rubber is a copolymer of:
(a) CH₂=CH–CCl=CH₂ and CH₂=CH–CH=CH₂
(b) CH₂=CH–CH=CH₂ and C₆H₅–CH=CH₂
(c) CH₂=CH–CN and CH₂=CH–CH=CH₂
(d) CH₂=CH–CN and CH₂=C(CH₃)–CH=CH₂
Show Answer & Explanation

Answer: (c) CH₂=CH–CN and CH₂=CH–CH=CH₂

Explanation:
1. Buna-N is made from 1,3-butadiene and acrylonitrile (vinyl cyanide).
2. Buna-S uses styrene instead of acrylonitrile and neoprene uses chloroprene.

Teacher's Note:
1. Bu = butadiene, Na = sodium, N = nitrile (acrylonitrile).

Question 12: Bakelite is obtained from phenol by reacting it with:
(a) (CH₂OH)₂
(b) CH₃CHO
(c) CH₃COCH₃
(d) HCHO
Show Answer & Explanation

Answer: (d) HCHO

Explanation:
1. Phenol undergoes condensation with formaldehyde in acidic or basic medium.
2. Cross-linking gives the thermosetting resin bakelite.

Teacher's Note:
1. Phenol-formaldehyde resin is bakelite.

Question 13: Which of the following is a fully fluorinated polymer?
(a) PVC
(b) Thiokol
(c) Teflon
(d) Neoprene
Show Answer & Explanation

Answer: (c) Teflon

Explanation:
1. Teflon is polytetrafluoroethene, –[CF₂–CF₂]ₙ–.
2. PVC contains chlorine, Thiokol contains sulphur and neoprene contains chlorine.

Teacher's Note:
1. Teflon is made from tetrafluoroethene, which contains only C and F.

Question 14: Which of the following is a polyamide?
(a) Bakelite
(b) Terylene
(c) Nylon-6,6
(d) Teflon
Show Answer & Explanation

Answer: (c) Nylon-6,6

Explanation:
1. Nylon-6,6 has repeating amide (–CO–NH–) linkages.
2. Terylene is a polyester, bakelite is a phenol-formaldehyde resin and Teflon is a fluoro-polymer.

Teacher's Note:
1. Nylons are polyamides.

Question 15: Nylon threads are made up of:
(a) polyvinyl polymer
(b) polyester polymer
(c) polyamide polymer
(d) polyethylene polymer
Show Answer & Explanation

Answer: (c) polyamide polymer

Explanation:
1. Nylon-6 and nylon-6,6 contain the amide linkage –CO–NH– in the chain.
2. Hence nylon is a polyamide.

Teacher's Note:
1. Nylon = polyamide.

Question 16: Nylon-6 is obtained by heating which compound with a little water at about 530 K?
(a) Caprolactam
(b) Adipic acid
(c) Hexamethylenediamine
(d) Ethylene glycol
Show Answer & Explanation

Answer: (a) Caprolactam

Explanation:
1. Caprolactam is hydrolysed to 6-aminohexanoic acid.
2. Its self-condensation (polymerisation) gives nylon-6, –[NH–(CH₂)₅–CO]ₙ–.

Teacher's Note:
1. Nylon-6 is made from a single monomer, caprolactam.

Question 17: The addition polymer of isobutylene, CH₂=C(CH₃)₂, is called:
(a) polyisobutane
(b) poly-tert-butylene
(c) polyisoprene
(d) polyisobutylene
Show Answer & Explanation

Answer: (d) polyisobutylene

Explanation:
1. Isobutylene polymerises by addition across the double bond.
2. The polymer is named after its monomer: polyisobutylene.

Teacher's Note:
1. Addition polymers are named poly(monomer).

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