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NEET • CHEMISTRY • POLYMERS

Polymers practice · Mixed difficulty

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Showing 1-30 of 99 questions
1 Medium
1 of 99
Analyzing +4 | -1
Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation
I.     NO2C6H5−CH=CH2\mathrm{I}\mathrm{.}\,\,\,\,\,\mathrm{N}{\mathrm{O}_2}{\mathrm{C}_6}{\mathrm{H}_5} - \mathrm{CH} = \mathrm{C}{\mathrm{H}_2}
II.     CH2=CH−C6H5CH3\mathrm{II}\mathrm{.}\,\,\,\,\,\mathrm{C}{\mathrm{H}_2} = \mathrm{CH} - {\mathrm{C}_6}{\mathrm{H}_5}\mathrm{C}{\mathrm{H}_3}
III.     CH2=CH−C6H5OCH3\mathrm{III}\mathrm{.}\,\,\,\,\,\mathrm{C}{\mathrm{H}_2} = \mathrm{CH} - {\mathrm{C}_6}{\mathrm{H}_5}\mathrm{OC}{\mathrm{H}_3}
View answer and explanation
Correct option: B
III > II > I
Option B (III > II > I) is correct because electron-donating groups enhance cationic polymerization, while electron-withdrawing groups hinder it.
2 Easy
2 of 99
Remembering +4 | -1
Thiokol is a
View answer and explanation
Correct option: C
Rubber
Option C (Rubber) is correct because Thiokol is a synthetic rubber, specifically a polysulfide rubber.
3 Medium
3 of 99
Understanding +4 | -1
Assertion: Vulcanisation of rubber increases its tensile strength.

Reason: Sulphur cross links are formed between poly-isoprene chains during vulcanisation.
View answer and explanation
Correct option: A
Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
Option A (Both assertion and reason are correct statements, and reason is the correct explanation of the assertion) is correct because vulcanization increases tensile strength due to the formation of sulfur cross-links between the polyisoprene chains.
4 Hard
4 of 99
Remembering +4 | -1
Select the correct statement.
View answer and explanation
Correct option: D
All of the above are correct
Option D is correct because all the listed statements accurately describe the composition of Vinyon, Saran, and Butyl rubber.
5 Easy
5 of 99
Understanding +4 | -1
Which of the following type of forces are present in vulcanized rubber?
View answer and explanation
Correct option: A
Weakest intermolecular forces
Option A (Weakest intermolecular forces) is correct because vulcanized rubber primarily relies on weak intermolecular forces for its elasticity, even with the presence of cross-linking.
6 Medium
6 of 99
Understanding +4 | -1
Which of the following is not an example of addition polymer?
View answer and explanation
Correct option: A
Terylene
Option A (Terylene) is correct because Terylene (polyethylene terephthalate) is a condensation polymer, not an addition polymer.
7 Medium
7 of 99
Remembering +4 | -1
Whether small molecules liberate in addition
polymerisation?
View answer and explanation
Correct option: B
No
Option B (No) is correct because addition polymerization involves the direct addition of monomers without the elimination of any small molecules.
8 Hard
8 of 99
Understanding +4 | -1
Arrange the following polymers in increasing order of their intermolecular forces.

Nylon-6, 6, buna-S, polythene, neoprene
View answer and explanation
Correct option: B
Neoprene << buna-S << polythene << nylon- 6,6
Option B is correct because the intermolecular forces depend on the structure and bonding in each polymer, with nylon-6,6 having the strongest due to hydrogen bonding.
9 Medium
9 of 99
Understanding +4 | -1
Which of the following is a condensation polymer?
View answer and explanation
Correct option: D
Polyethylene terephthalate
Option D (Polyethylene terephthalate) is correct because it is formed through a condensation reaction between ethylene glycol and terephthalic acid.
10 Medium
10 of 99
Understanding +4 | -1
Which of the following is not an example of a condensation polymer?
View answer and explanation
Correct option: C
Buna- N
Option C (Buna- N) is correct because Buna-N is an addition polymer, not a condensation polymer.
11 Hard
11 of 99
Understanding +4 | -1
Assertion:- Natural Rubber has elastic property.

Reason:- It has linear structure.
View answer and explanation
Correct option: B
If both assertion & reason true but reason is not a correct explanation of the assertion
Option B (If both assertion & reason true but reason is not a correct explanation of the assertion) is correct because while natural rubber does have elastic properties and it has a linear structure, the linear structure is not the reason for its elasticity.
12 Medium
12 of 99
Understanding +4 | -1
Which one of the following statement is wrong?
View answer and explanation
Correct option: B
Dibenzol peroxide is a catalyst in the polymerization of PVC.
Option B (Dibenzol peroxide is a catalyst in the polymerization of PVC) is wrong because dibenzoyl peroxide is a catalyst for the polymerization of many alkenes, but not specifically for PVC. PVC uses other catalysts for its polymerization.
13 Easy
13 of 99
Remembering +4 | -1
Which of the following is a natural polymer?
View answer and explanation
Correct option: B
polysaccharides
Option B is correct because polysaccharides like starch and cellulose are naturally occurring polymers found in plants and animals.
14 Medium
14 of 99
Analyzing +4 | -1
Assertion :- When a rubber band is stretched entropy increases.

Reason :- During expansion entropy increases.
View answer and explanation
Correct option: D
If both Assertion & Reason are False
Option D (If both Assertion & Reason are False) is correct because when a rubber band is stretched, entropy decreases, and the reason provided is too general.
15 Medium
15 of 99
Understanding +4 | -1
Which of the following vinyl derivatives is most reactive towards anionic polymerisation?
View answer and explanation
Correct option: D
CH2=CHC=N\mathrm{C}{\mathrm{H}_2} = \mathrm{CHC} = \mathrm{N}
Option D (CH2=CHC=N\mathrm{C}{\mathrm{H}_2} = \mathrm{CHC} = \mathrm{N}) is correct because the presence of the electron-withdrawing cyano group activates the vinyl group towards nucleophilic attack in anionic polymerization.

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16 Medium
16 of 99
Understanding +4 | -1
In which of the following polymers, empirical formula resembles with monomer?
View answer and explanation
Correct option: B
Teflon
Option B (Teflon) is correct because the empirical formula of Teflon (CF2CF_2) is the same as its monomer, tetrafluoroethylene (C2F4C_2F_4).
17 Medium
17 of 99
Understanding +4 | -1
Consider following statements
I. Cationic polymerization occurs in monomers with electron donation substitutents.
II. Anionic polymerization occurs in monomers with electron-withdrawing substitutents.
III. Head-to-head chain growth polymerisation occurs in polystyrene
Select correct statements
View answer and explanation
Correct option: A
I,II
Option A (I,II) is correct because cationic polymerization is favored by electron-donating substituents, and anionic polymerization is favored by electron-withdrawing substituents.
18 Easy
18 of 99
Understanding +4 | -1
A homopolymer is obtained by polymerization of:
View answer and explanation
Correct option: A
One type of monomer units
Option A (One type of monomer units) is correct because a homopolymer is defined as a polymer made from only one type of monomer.
19 Easy
19 of 99
Understanding +4 | -1
Assertion (A): The empirical formula of natural rubber is C5H8{C}_5 {H}_8.

Reason (R): Natural rubber contains no conjugative double bonds.
View answer and explanation
Correct option: B
Both A and R are correct, but R is not the correct explanation of A
Option B (Both A and R are correct, but R is not the correct explanation of A) is correct because while both the empirical formula of natural rubber is C5H8{C}_5 {H}_8 and it lacks conjugative double bonds are true, the latter doesn't explain the former.
20 Easy
20 of 99
Understanding +4 | -1
Polyethene, PVC, Teflon and neoprene are all
View answer and explanation
Correct option: B
Addition homopolymers
Option B (Addition homopolymers) is correct because polyethene, PVC, Teflon, and neoprene are formed by the addition polymerization of a single type of monomer.
21 Medium
21 of 99
Understanding +4 | -1
Assertion: HDP has lesser flexibility than LDP.

Reason: LDP has a more branched structure than HDP.
View answer and explanation
Correct option: A
Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
Option A (Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.) is correct because HDP has a more linear structure, resulting in less flexibility compared to LDP, which has branching.
22 Medium
22 of 99
Remembering +4 | -1
Natural rubber is polymer of
View answer and explanation
Correct option: A
Cis – polyisoprene
Option A (Cis – polyisoprene) is correct because natural rubber is a polymer of cis-isoprene units.
23 Medium
23 of 99
Understanding +4 | -1
Assertion: Benzoyl peroxide is necessary for free radical polymerisation.

Reason: Peroxides give the necessary free radicals required for initiating the polymerisation process.
View answer and explanation
Correct option: A
Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
Option A (Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.) is correct because benzoyl peroxide decomposes to generate free radicals that initiate the polymerization process.
24 Medium
24 of 99
Remembering +4 | -1
Which among the following is a homopolymer?
View answer and explanation
Correct option: B
Neoprene
Option B is correct because Neoprene is a polymer made from a single type of monomer (chloroprene), making it a homopolymer.
25 Easy
25 of 99
Remembering +4 | -1
The starting materials of PCTFE are:
View answer and explanation
Correct option: A
Monochlorotrifluoro ethylene
Option A is correct because PCTFE (Polychlorotrifluoroethylene) is made from Monochlorotrifluoroethylene.
26 Easy
26 of 99
Remembering +4 | -1
Rubber is heated with Sulphur and the process is known:
View answer and explanation
Correct option: B
Vulcanization
Option B (Vulcanization) is correct because vulcanization is the process of heating rubber with sulfur to improve its strength and elasticity.
27 Medium
27 of 99
Understanding +4 | -1
A copolymer is obtained by polymerisation of:
View answer and explanation
Correct option: B
More than one type of monomer units
Option B (More than one type of monomer units) is correct because a copolymer is, by definition, formed from the polymerization of two or more different types of monomers.
28 Medium
28 of 99
Analyzing +4 | -1
Two condensation polymers are made

(1) ethylene diamine + ethane-1,2-dicarboxylic acid

(2) trimethylenediamine + ethane-1,2-dicarboxylic acid if both polymers of same molecular weight are obtained then which of the following statements is/are correct?

(i) Polymer (1) is found to melt at lower temperature.

(ii) Polymer (2) is found to melt at lower temperature.

(iii) H-bonding is major factor.
View answer and explanation
Correct option: D
(ii) and (iii)
Option D ((ii) and (iii)) is correct because polymer (2) has weaker intermolecular forces due to the longer alkyl chain, leading to a lower melting temperature, and H-bonding is a major factor in condensation polymers.
29 Easy
29 of 99
Remembering +4 | -1
Bakelite is a copolymer of:
View answer and explanation
Correct option: B
HCHO and phenol
The correct answer is B (HCHO and phenol) because Bakelite is a thermosetting polymer formed by the condensation polymerization of formaldehyde (HCHO) and phenol.
30 Medium
30 of 99
Understanding +4 | -1
Chloroprene is obtained by addition of HCI to
View answer and explanation
Correct option: C
Vinylacetylene
Option C (Vinylacetylene) is correct because chloroprene (2-chloro-1,3-butadiene) is formed by the addition of HCl to vinylacetylene.
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