JEE Chemistry Polymers MCQs Set 04

Multiple Choice Questions (MCQs) for JEE Chemistry: Polymers

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Multiple Choice Questions

Question 1: Which of the following is the monomer of polystyrene?
(a) CH2=CH-CN
(b) CF2=CF2
(c) CH2=CHCl
(d) CH2=CH-C6H5
Show Answer & Explanation

Answer: (d) CH2=CH-C6H5

Explanation:
1. Polystyrene is formed by addition polymerisation of styrene, phenylethene.
2. CH2=CHCN gives polyacrylonitrile, CF2=CF2 gives Teflon and CH2=CHCl gives PVC.

Teacher's Note:
1. Match each polymer with its monomer.
2. Styrene has a phenyl group on one carbon of the double bond.

Question 2: Weakest intermolecular forces are present in
(a) neoprene
(b) terylene
(c) polystyrene
(d) bakelite
Show Answer & Explanation

Answer: (a) neoprene

Explanation:
1. Neoprene is an elastomer, and elastomers have the weakest intermolecular forces, which allow stretching.
2. Polystyrene is a thermoplastic, terylene is a fibre and bakelite is a cross-linked thermoset.

Teacher's Note:
1. Order of strength is elastomers, then thermoplastics, then fibres.
2. Cross-linked polymers are held by covalent bonds.

Question 3: 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 formaldehyde (HCHO), first to a linear novolac and then to a cross-linked bakelite.

Teacher's Note:
1. Bakelite is used for switches and handles.
2. Formaldehyde gives methylene bridges at ortho and para positions.

Question 4: Which one is classified as a condensation polymer?
(a) Teflon
(b) Acrylonitrile
(c) Dacron
(d) Neoprene
Show Answer & Explanation

Answer: (c) Dacron

Explanation:
1. Dacron (terylene) is formed from terephthalic acid and ethylene glycol with loss of water.
2. Teflon, polyacrylonitrile and neoprene are addition polymers.

Teacher's Note:
1. Condensation polymers lose small molecules such as water.
2. Nylon, terylene, bakelite and melamine are standard examples.

Question 5: Novolac is a
(a) linear polymer of urea and formaldehyde
(b) cross-linked polymer of urea and formaldehyde
(c) linear polymer of phenol and formaldehyde
(d) cross-linked polymer of phenol and formaldehyde
Show Answer & Explanation

Answer: (c) linear polymer of phenol and formaldehyde

Explanation:
1. Phenol reacts with less than one mole of formaldehyde in acid medium to give novolac, a linear polymer.
2. Heating with more formaldehyde cross-links it to bakelite.

Teacher's Note:
1. Novolac is linear and fusible.
2. Bakelite is the final cross-linked product.

Question 6: Which of the following is not a semi-synthetic polymer?
(a) cis-polyisoprene
(b) cellulose nitrate
(c) cellulose acetate
(d) vulcanised rubber
Show Answer & Explanation

Answer: (a) cis-polyisoprene

Explanation:
1. cis-Polyisoprene is natural rubber, a natural polymer.
2. Cellulose nitrate and acetate are chemical modifications of cellulose, and vulcanised rubber is natural rubber modified with sulphur.

Teacher's Note:
1. Semi-synthetic polymers are modified natural polymers.
2. Rayon is another example.

Question 7: Which one of the following polymers is formed by condensation polymerisation?
(a) Styrene
(b) Nylon-66
(c) Teflon
(d) Rubber
Show Answer & Explanation

Answer: (b) Nylon-66

Explanation:
1. Nylon-66 is formed from hexamethylenediamine and adipic acid with loss of water.
2. The others are addition polymers or natural rubber.

Teacher's Note:
1. Nylon-66 is a polyamide.
2. The 6 and 6 stand for the carbon atoms in diamine and acid.

Question 8: Which of the following statements is not true?
(a) Natural rubber has the trans configuration at every double bond
(b) Buna-S is a copolymer of butadiene and styrene
(c) Natural rubber is a 1,4-polymer of isoprene
(d) In vulcanisation, the formation of sulphur bridges between different chains makes rubber harder and stronger
Show Answer & Explanation

Answer: (a) Natural rubber has the trans configuration at every double bond

Explanation:
1. Natural rubber has the cis configuration at every double bond, so (a) is false.
2. The other statements are correct.

Teacher's Note:
1. Trans-polyisoprene is gutta-percha.
2. Vulcanisation was discovered by Goodyear.

Question 9: Which of the following polymers is not correctly represented? (i) Nylon-66: -[NH(CH2)6NHCO(CH2)4CO]n- (ii) Teflon: -[CF2-CF2]n- (iii) Neoprene: -[CH2-C(Cl)=CH-CH2-CH2]n- (iv) Terylene: -[OC-C6H4-COOCH2CH2O]n-
(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)
Show Answer & Explanation

Answer: (c) (iii)

Explanation:
1. Neoprene is a polymer of chloroprene, so the repeat unit is -[CH2-C(Cl)=CH-CH2]- with four carbons.
2. The repeat unit shown in (iii) has an extra CH2 group, so it is wrong.
3. The others are correct.

Teacher's Note:
1. Count the carbon atoms in the repeat unit.
2. Chloroprene is 2-chlorobuta-1,3-diene, C4H5Cl.

Question 10: Which of the following is an example of polyester polymer?
(a) Terylene
(b) Bakelite
(c) Melamine
(d) Nylon-66
Show Answer & Explanation

Answer: (a) Terylene

Explanation:
1. Terylene (Dacron) has ester links, -COO-, between the repeat units.
2. Nylon-66 is a polyamide, and bakelite and melamine resins are cross-linked condensation polymers.

Teacher's Note:
1. Terylene comes from ethylene glycol and terephthalic acid.
2. Glyptal is another polyester.

Question 11: Which of the following is not a condensation polymer?
(a) Dacron
(b) Neoprene
(c) Melamine
(d) Glyptal
Show Answer & Explanation

Answer: (b) Neoprene

Explanation:
1. Neoprene is formed by addition polymerisation of chloroprene.
2. Dacron, melamine resin and glyptal are condensation polymers.

Teacher's Note:
1. Glyptal is made from ethylene glycol and phthalic acid.
2. Melamine resin comes from melamine and formaldehyde.

Question 12: Which of the following statements is false?
(a) The repeat unit in natural rubber is isoprene
(b) Both starch and cellulose are polymers of glucose
(c) Artificial silk is derived from cellulose
(d) Nylon-66 is an example of an elastomer
Show Answer & Explanation

Answer: (d) Nylon-66 is an example of an elastomer

Explanation:
1. Nylon-66 is a fibre (polyamide), not an elastomer.
2. The other statements are true.

Teacher's Note:
1. Elastomers include natural rubber, neoprene and Buna-S.
2. Rayon is cellulose acetate or viscose.

Question 13: Which one of the following sets forms a biodegradable polymer?
(a) HOCH2CH2OH and 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 form nylon 2-nylon 6, a biodegradable copolymer.
2. The other sets give non-biodegradable polymers (glyptal-type polyester, Buna-S and Buna-N).

Teacher's Note:
1. Biodegradable polymers have groups that enzymes can hydrolyse.
2. PHBV is another example.

Question 14: Nylon is an example of
(a) polythene
(b) polyester
(c) polysaccharide
(d) polyamide
Show Answer & Explanation

Answer: (d) polyamide

Explanation:
1. Nylons contain amide links, -CO-NH-, between repeat units.

Teacher's Note:
1. Proteins are natural polyamides.
2. Nylon-6 and nylon-66 are common.

Question 15: Which of the following is the monomer of neoprene?
(a) CH2=CH-C≡CH
(b) CH2=CH-CH=CH2
(c) CH2=C(CH3)-CH=CH2
(d) CH2=C(Cl)-CH=CH2
Show Answer & Explanation

Answer: (d) CH2=C(Cl)-CH=CH2

Explanation:
1. Neoprene is polychloroprene, whose monomer is 2-chlorobuta-1,3-diene.

Teacher's Note:
1. Neoprene resists oil and heat.
2. It is used for gaskets and hoses.

Question 16: The organic compounds which polymerise to form the polyester Dacron are
(a) propylene and para-HO-C6H4-OH
(b) benzoic acid and ethanol
(c) terephthalic acid and ethylene glycol
(d) benzoic acid and para-HO-C6H4-OH
Show Answer & Explanation

Answer: (c) terephthalic acid and ethylene glycol

Explanation:
1. Dacron is made by condensation of terephthalic acid with ethylene glycol, losing water.

Teacher's Note:
1. This is a step-growth polymerisation.
2. Each monomer has two functional groups.

Question 17: Nylon 2-nylon 6 is a copolymer of
(a) glycine and adipic acid
(b) glycine and 6-aminohexanoic acid
(c) adipic acid and hexamethylenediamine
(d) 6-aminohexanoic acid and alanine
Show Answer & Explanation

Answer: (b) glycine and 6-aminohexanoic acid

Explanation:
1. Nylon 2-nylon 6 is made from glycine (2 carbons) and 6-aminohexanoic acid (aminocaproic acid, 6 carbons).
2. It is biodegradable.

Teacher's Note:
1. The numbers 2 and 6 give carbons in the monomers.
2. It is an alternating polyamide.

Question 18: Caprolactam is used for the manufacture of
(a) terylene
(b) nylon-66
(c) nylon-6
(d) Teflon
Show Answer & Explanation

Answer: (c) nylon-6

Explanation:
1. Caprolactam on heating with water gives nylon-6 by ring-opening polymerisation.

Teacher's Note:
1. It is a cyclic amide with six carbons.
2. Nylon-66 uses adipic acid and hexamethylenediamine.

Question 19: A biodegradable polymer which can be produced from glycine and aminocaproic acid is
(a) PHBV
(b) Buna-N
(c) Nylon-6,6
(d) Nylon 2-nylon 6
Show Answer & Explanation

Answer: (d) Nylon 2-nylon 6

Explanation:
1. Glycine and 6-aminocaproic acid condense to give nylon 2-nylon 6, which is biodegradable.
2. PHBV is made from hydroxy acids, and Buna-N and nylon-66 are not biodegradable.

Teacher's Note:
1. Biodegradable polymers are used in surgery and packaging.
2. PHBV comes from 3-hydroxybutanoic acid and 3-hydroxypentanoic acid.

Question 20: Natural rubber has
(a) all cis-configuration
(b) all trans-configuration
(c) alternate cis and trans configuration
(d) random cis and trans configuration
Show Answer & Explanation

Answer: (a) all cis-configuration

Explanation:
1. Every double bond in natural rubber is cis, as the chains are coiled and elastic.

Teacher's Note:
1. Gutta-percha has the trans configuration.
2. The cis arrangement prevents close packing.

Question 21: Which one of the following is an example of a thermosetting polymer? Choose the polymer name.
(a) Neoprene
(b) PVC
(c) Nylon-66
(d) Bakelite
Show Answer & Explanation

Answer: (d) Bakelite

Explanation:
1. Bakelite is a cross-linked phenol-formaldehyde resin that cannot be softened by heating again.
2. The others are elastomer, thermoplastic and fibre.

Teacher's Note:
1. Thermosetting plastics include bakelite and melamine.
2. They are cross-linked.

Question 22: Which of the following are the monomers of natural rubber and neoprene respectively?
(a) isoprene and chloroprene
(b) chloroprene and isoprene
(c) butadiene and chloroprene
(d) isoprene and butadiene
Show Answer & Explanation

Answer: (a) isoprene and chloroprene

Explanation:
1. Natural rubber is a polymer of isoprene (2-methylbuta-1,3-diene).
2. Neoprene is a polymer of chloroprene (2-chlorobuta-1,3-diene).

Teacher's Note:
1. Only the substituent at C-2 differs.
2. CH3 gives rubber and Cl gives neoprene.

Question 23: Match the polymers with their monomers or related terms. (a) PHBV (b) Bakelite (c) Neoprene (d) Glyptal: (p) biodegradable (q) chloroprene (r) phthalic acid (s) phenol
(a) a-p, b-s, c-q, d-r
(b) a-p, b-q, c-r, d-s
(c) a-r, b-s, c-q, d-p
(d) a-s, b-q, c-p, d-r
Show Answer & Explanation

Answer: (a) a-p, b-s, c-q, d-r

Explanation:
1. PHBV (poly 3-hydroxybutanoate-co-3-hydroxypentanoate) is biodegradable.
2. Bakelite is made from phenol and formaldehyde.
3. Neoprene comes from chloroprene, and glyptal from ethylene glycol and phthalic acid.

Teacher's Note:
1. Glyptal is used in paints and lacquers.
2. Match from the monomers of each.

Question 24: Assertion (A): Polypropylene is an addition polymer.
Reason (R): The monomer unit of polypropylene is CH3-CH=CH2.
(a) Both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) Both Assertion and Reason are false.
Show Answer & Explanation

Answer: (b) Both Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

Explanation:
1. Polypropylene forms by addition of propene units, so A is true.
2. The monomer is propene, so R is true.
3. R states what the monomer is but does not by itself explain why the process is addition.

Teacher's Note:
1. Addition polymers form from unsaturated monomers.
2. Propene has a C=C double bond.

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