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Polymers

NEET 2018MCQMedium📈 Topic in 25% papers+4−1
Ques. 1NEET 2018

Regarding cross-linked or network polymers, which of the following statements is incorrect?

  1. They contain covalent bonds between various linear polymer chains.
  2. They are formed from bi- and tri-functional monomers.
  3. Examples are bakelite and melamine.
  4. They contain strong covalent bonds in their polymer chains.

Answer

(4) They contain strong covalent bonds in their polymer chains.

Solution

As per NCERT, cross-linked or network polymers are usually formed from bi-functional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains, e.g. bakelite, melamine.

⇒ Statements (A), (B) and (C) are the NCERT description.

Statement (D) speaks of bonds within the polymer chains, which does not describe the cross-links (bonds between the chains) that characterise these polymers.

∴ Statement (D) is incorrect.

Answer: (4)

Out of syllabus

Keep practising — Polymers

Ques. 2NEET 2016 (Phase 1)

Natural rubber has

  1. alternate cis- and trans-configuration
  2. random cis- and trans-configuration
  3. all cis-configuration
  4. all trans-configuration.
Out of syllabus
Ques. 3NEET 2016 (Phase 2)

Which one of the following structures represents nylon 6, 6 polymer?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Out of syllabus
Ques. 4AIPMT 2015

Caprolactam is used for the manufacture of

  1. teflon
  2. terylene
  3. nylon 6, 6
  4. nylon 6
Out of syllabus
Ques. 5AIPMT 2015 (Cancelled)

Biodegradable polymer which can be produced from glycine and aminocaproic acid is

  1. buna - N
  2. nylon 6, 6
  3. nylon 2-nylon 6
  4. PHBV
Out of syllabus
Ques. 6AIPMT 2014

Which of the following organic compounds polymerizes to form the polyester dacron?

  1. Propylene and para HO-(C6H4)-OH
  2. Benzoic acid and ethanol
  3. Terephthalic acid and ethylene glycol
  4. Benzoic acid and para HO-(C6H4)-OH
Out of syllabus
Ques. 7AIPMT 2014

Which one of the following is an example of thermosetting polymer?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Out of syllabus
Ques. 8NEET 2013

Nylon is an example of

  1. polyamide
  2. polythene
  3. polyester
  4. polysaccharide.
Out of syllabus
Ques. 9NEET 2013

Which is the monomer of neoprene in the following?

  1. CH2= Cl |C-CH=CH2
  2. CH2=CH-C CH
  3. CH2=CH-CH=CH2
  4. CH2= CH3 |C-CH=CH2
Out of syllabus
Ques. 10AIPMT 2012 (Mains)

Which one of the following sets forms the biodegradable polymer?

  1. CH2=CH-CN and CH2=CH-CH=CH2
  2. H2N-CH2-COOH and H2N-(CH2)5-COOH
  3. HO-CH2-CH2-OH and [figure]
  4. [figure] and CH2=CH-CH=CH2
Out of syllabus
Ques. 11AIPMT 2012 (Prelims)

Which one of the following is not a condensation polymer?

  1. Melamine
  2. Glyptal
  3. Dacron
  4. Neoprene
Out of syllabus

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Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
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