Chemistry Objective Questions and Answers: 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.
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Multiple Choice Questions
(a) Polystyrene
(b) Nylon
(c) PVC
(d) Polypropylene
Show Answer & Explanation
Answer: (b) Nylon
Explanation:
1. Polystyrene, PVC and polypropylene are formed by addition polymerisation of alkenes.
2. Nylon is a polyamide formed by condensation polymerisation.
Teacher's Note:
1. Addition polymers form from monomers with double bonds without loss of any small molecule.
(a) cross-linked polymers
(b) polymers that do not melt or soften on heating
(c) polymers in which cross-linking is usually developed at the time of moulding, where they harden irreversibly
(d) all of the above
Show Answer & Explanation
Answer: (d) all of the above
Explanation:
1. Thermosetting polymers are cross-linked, so they do not soften on heating.
2. The cross-linking develops during moulding and hardening is irreversible, so all three statements are true.
Teacher's Note:
1. Thermosets cannot be remoulded once set.
(a) rubber
(b) nylon-6
(c) terylene
(d) orlon
Show Answer & Explanation
Answer: (b) nylon-6
Explanation:
1. Perlon is the trade name of nylon-6.
2. It is made from caprolactam.
Teacher's Note:
1. Perlon = nylon-6.
(a) –[CH₂–C(CH₃)=CH–CH₂]ₙ–
(b) –[CH₂–CH=CH–CH₂–CH(C₆H₅)–CH₂]ₙ–
(c) –[CH₂–CH=CH–CH₂–CH(CN)–CH₂]ₙ–
(d) –[CH₂–C(Cl)=CH–CH₂]ₙ–
Show Answer & Explanation
Answer: (b) –[CH₂–CH=CH–CH₂–CH(C₆H₅)–CH₂]ₙ–
Explanation:
1. Buna-S (SBR) is a copolymer of 1,3-butadiene and styrene.
2. Its unit contains a butadiene part –CH₂–CH=CH–CH₂– joined to a styrene part –CH₂–CH(C₆H₅)–.
Teacher's Note:
1. Bu = butadiene, na = sodium, S = styrene.
(a) polypropylene
(b) polyvinyl chloride
(c) polythene
(d) polymethyl methacrylate
Show Answer & Explanation
Answer: (d) polymethyl methacrylate
Explanation:
1. Polymethyl methacrylate (PMMA, plexiglass) is hard, rigid and transparent.
2. It is therefore used for optical lenses.
Teacher's Note:
1. PMMA is a transparent plastic.
(a) nylon-6
(b) PMMA
(c) PVC
(d) polythene
Show Answer & Explanation
Answer: (b) PMMA
Explanation:
1. PMMA (and polycarbonate) are strong, transparent, impact resistant polymers used in bullet proof glass.
2. Nylon-6, PVC and polythene are not used for this purpose.
Teacher's Note:
1. Transparent, tough polymers such as PMMA are used for bullet proof glass.
(a) Terylene
(b) Polyethylene
(c) Polypropylene
(d) Nylon-6
Show Answer & Explanation
Answer: (d) Nylon-6
Explanation:
1. Nylon tyre cord is made from high tenacity continuous filament yarn.
2. Nylon-6 is used for tyre cords.
Teacher's Note:
1. Tyre cords need a strong fibre such as nylon.
(a) nylon-6,20
(b) nylon-6,01
(c) nylon-6,10
(d) none of these
Show Answer & Explanation
Answer: (c) nylon-6,10
Explanation:
1. Hexamethylenediamine has six carbons and sebacoyl chloride (from sebacic acid, HOOC(CH₂)₈COOH) has ten carbons.
2. The polymer is nylon-6,10.
Teacher's Note:
1. Nylon-x,y is named by the carbon counts of the diamine and the diacid.
(a) less than 1
(b) greater than 1
(c) equal to 1
(d) 0
Show Answer & Explanation
Answer: (b) greater than 1
Explanation:
1. Polydispersity index = Mw/Mn = 40,000/30,000 = 1.33.
2. This is greater than 1, as it is for every polydisperse sample.
Teacher's Note:
1. PDI is 1 only for a monodisperse polymer.
(a) S₈
(b) CF₄
(c) Cl₂F₂
(d) C₂F₂
Show Answer & Explanation
Answer: (a) S₈
Explanation:
1. Vulcanisation heats natural rubber with sulphur and an accelerator.
2. Sulphur forms cross-links between the chains, making the rubber harder and stronger.
Teacher's Note:
1. Vulcanisation cross-links rubber chains with sulphur.
(a) In vulcanisation the formation of sulphur bridges between different chains makes rubber harder and stronger
(b) Natural rubber has the trans configuration at every double bond
(c) Buna-S is a copolymer of butadiene and styrene
(d) Natural rubber is a 1,4-polymer of isoprene
Show Answer & Explanation
Answer: (b) Natural rubber has the trans configuration at every double bond
Explanation:
1. Vulcanisation cross-links the chains, Buna-S is a butadiene-styrene copolymer and natural rubber is cis-1,4-polyisoprene.
2. Natural rubber has the cis configuration at every double bond, not trans, so (b) is not true.
Teacher's Note:
1. Natural rubber is cis-polyisoprene; gutta-percha is the trans form.
(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. Nylon-2-nylon-6 is an alternating polyamide of glycine (H₂N–CH₂–COOH) and 6-aminohexanoic acid (aminocaproic acid).
2. It is biodegradable, unlike nylon-6,6; PHBV is made from hydroxy acids.
Teacher's Note:
1. Nylon-2-nylon-6 uses the amino acids glycine and aminocaproic acid.
(a) 4900
(b) 4600
(c) 4300
(d) 5200
Show Answer & Explanation
Answer: (a) 4900
Explanation:
1. The molar mass of the repeating unit C₂H₄ is 28.
2. Mw = ΣNᵢMᵢ²/ΣNᵢMᵢ = (2 × 100² + 3 × 200²)/(2 × 100 + 3 × 200) × 28 = (140000/800) × 28 = 175 × 28 = 4900.
Teacher's Note:
1. Weight average uses the squares of the molar masses weighted by the number of molecules.
(a) Nylon
(b) Polyvinyl chloride
(c) Cellulose
(d) Natural rubber
Show Answer & Explanation
Answer: (d) Natural rubber
Explanation:
1. Nylon and cellulose have strong hydrogen bonding, and PVC has dipole-dipole attraction.
2. Natural rubber is a non-polar elastomer held only by weak van der Waals forces.
Teacher's Note:
1. Elastomers have the weakest intermolecular forces.
(a) Terylene
(b) Nylon
(c) Rubber
(d) Vulcanised rubber
Show Answer & Explanation
Answer: (b) Nylon
Explanation:
1. Nylon has amide (–CO–NH–) links in the chain.
2. Terylene is a polyester and the rubbers are hydrocarbon polymers.
Teacher's Note:
1. Nylons are polyamides.
(a) natural rubber
(b) synthetic rubber
(c) highly vulcanised rubber
(d) polypropene
Show Answer & Explanation
Answer: (c) highly vulcanised rubber
Explanation:
1. Ebonite is obtained by heating rubber with a large amount of sulphur (25-30%).
2. This gives a hard, highly vulcanised rubber.
Teacher's Note:
1. More sulphur gives harder rubber.
(a) COOH(CH₂)₄COOH + NH₂C₆H₄NH₂
(b) COOH(CH₂)₄COOH + NH₂(CH₂)₆NH₂
(c) COOH(CH₂)₆COOH + NH₂(CH₂)₄NH₂
(d) COOHC₆H₄COOH + NH₂(CH₂)₆NH₂
Show Answer & Explanation
Answer: (b) COOH(CH₂)₄COOH + NH₂(CH₂)₆NH₂
Explanation:
1. Nylon-6,6 contains two six-carbon units.
2. Adipic acid HOOC(CH₂)₄COOH and hexamethylenediamine H₂N(CH₂)₆NH₂ condense with loss of water to give it.
Teacher's Note:
1. The diacid and diamine each have six carbons.
(a) Melmac
(b) Bakelite
(c) Polythene
(d) Vulcanised rubber
Show Answer & Explanation
Answer: (c) Polythene
Explanation:
1. Melmac and Bakelite are cross-linked thermosets, and vulcanised rubber is cross-linked by sulphur bridges.
2. Polythene is a linear or branched thermoplastic with no cross-links.
Teacher's Note:
1. Cross-linking is absent in thermoplastics.
(a) condensation or addition reaction between monomers
(b) coordinate reaction between monomers
(c) conversion of monomer to monomer ions
(d) hydrolysis of monomers
Show Answer & Explanation
Answer: (a) condensation or addition reaction between monomers
Explanation:
1. Polymerisation links monomer molecules through addition or condensation reactions.
2. It does not need ion formation or hydrolysis.
Teacher's Note:
1. Polymers form by addition or condensation.
(a) Nylon, PVC
(b) PAN, PTFE
(c) PCTFE, PTFE
(d) Bakelite, alkyl resin
Show Answer & Explanation
Answer: (c) PCTFE, PTFE
Explanation:
1. PCTFE (polychlorotrifluoroethylene) and PTFE are both fluoropolymers.
2. They are chemically inert and heat resistant.
Teacher's Note:
1. Fluorocarbon polymers are similar in properties.
(a) PMMA is plexiglass
(b) SBR is natural rubber
(c) PTFE is Teflon
(d) LDPE is low density polythene
Show Answer & Explanation
Answer: (b) SBR is natural rubber
Explanation:
1. PMMA is plexiglass, PTFE is Teflon and LDPE is low density polythene.
2. SBR is styrene-butadiene rubber, a synthetic rubber, so the statement that it is natural rubber is wrong.
Teacher's Note:
1. SBR = styrene butadiene rubber (Buna-S).
(a) ABS
(b) SBR
(c) NBR
(d) Nylon-2-nylon-6
Show Answer & Explanation
Answer: (a) ABS
Explanation:
1. ABS is made from acrylonitrile, butadiene and styrene.
2. SBR and NBR are copolymers of two monomers, and nylon-2-nylon-6 of two amino acids.
Teacher's Note:
1. ABS = acrylonitrile + butadiene + styrene.
(a) aniline
(b) 1,2,3-triazine-4,5,6-triamine
(c) 2,4,6-triamino-1,3,5-triazine
(d) 2,5-diaminopyridine
Show Answer & Explanation
Answer: (c) 2,4,6-triamino-1,3,5-triazine
Explanation:
1. Melamine is 2,4,6-triamino-1,3,5-triazine, a symmetrical triazine ring with three NH₂ groups.
2. It condenses with formaldehyde to give melmac.
Teacher's Note:
1. Melamine is the triamine of 1,3,5-triazine.
(a) Artificial silk is derived from cellulose
(b) Nylon-6,6 is an example of an elastomer
(c) The repeat unit in natural rubber is isoprene
(d) Both starch and cellulose are polymers of glucose
Show Answer & Explanation
Answer: (b) Nylon-6,6 is an example of an elastomer
Explanation:
1. Rayon is made from cellulose, rubber is built from isoprene units, and starch and cellulose are glucose polymers.
2. Nylon-6,6 is a fibre, not an elastomer, so (b) is false.
Teacher's Note:
1. Nylons are fibres; rubbers are elastomers.
(a) Neoprene
(b) PVC
(c) Nylon-6,6
(d) Phenol-formaldehyde resin (Bakelite)
Show Answer & Explanation
Answer: (d) Phenol-formaldehyde resin (Bakelite)
Explanation:
1. Phenol-formaldehyde resin is cross-linked and sets permanently on heating.
2. Neoprene is an elastomer, PVC and nylon-6,6 are thermoplastics.
Teacher's Note:
1. Cross-linked resins are thermosetting.
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FAQs
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