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Polymers

AIPMT 2008MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2008

Which one of the following statements is not true?

  1. Buna-S is a copolymer of butadiene and styrene.
  2. Natural rubber is a 1,4-polymer of isoprene.
  3. In vulcanization, the formation of sulphur bridges between different chains makes rubber harder and stronger.
  4. Natural rubber has the trans-configuration at every double bond.

Answer

(4) Natural rubber has the trans-configuration at every double bond.

Solution

As per NCERT, natural rubber is a linear polymer of isoprene (2-methyl-1,3-butadiene), called cis-1,4-polyisoprene.

⇒ Natural rubber has the cis-configuration (not trans) at every double bond; the trans form is gutta-percha.

∵ Buna-S is a copolymer of 1,3-butadiene and styrene, and vulcanisation forms sulphur cross-links that make rubber harder and stronger, statements (1), (2) and (3) are true.

∴ Statement (4) is not true.

Answer: (4)

Out of syllabus

Keep practising — Polymers

Ques. 2AIPMT 2007

Which one of the following polymers is prepared by condensation polymerisation?

  1. Teflon
  2. Natural rubber
  3. Polystyrene
  4. Nylon-6,6
Out of syllabus
Ques. 3AIPMT 2006

[ NH(CH2)6NHCO(CH2)4CO ]n is a

  1. homopolymer
  2. copolymer
  3. addition polymer
  4. thermosetting polymer.
Out of syllabus
Ques. 4AIPMT 2005

The monomer of the polymer [figure]

  1. [figure]
  2. CH3CH=CHCH3
  3. CH3CH=CH2
  4. (CH3)2C=C(CH3)2
Out of syllabus
Ques. 5AIPMT 2004

Which one of the following is a chain growth polymer?

  1. Starch
  2. Nucleic acid
  3. Polystyrene
  4. Protein
Out of syllabus
Ques. 6AIPMT 2003

Acrilan is a hard, horny and a high melting material. Which one of the following represents its structure?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Out of syllabus
Ques. 7AIPMT 2003

Which one of the following monomers gives the polymer neoprene on polymerization?

  1. CH2=CHCl
  2. CCl2=CCl2
  3. [figure]
  4. CF2=CF2
Out of syllabus
Ques. 8AIPMT 2002

Monomer of [figure] is

  1. 2-methylpropene
  2. styrene
  3. propylene
  4. ethene
Out of syllabus
Ques. 9AIPMT 2001

Which of the following is not correctly matched?

  1. Neoprene : [figure]
  2. Nylon-6,6 : [figure]
  3. Terylene : [figure]
  4. PMMA : [figure]
Out of syllabus
Ques. 10AIPMT 2000

CF2=CF2 is the monomer of

  1. teflon
  2. orlon
  3. polythene
  4. nylon-6
Out of syllabus

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