Tag: polymers

Questions Related to polymers

Which of the following monomers are unsuitable for condensation polymerization?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. hydroxy acids

  2. butane-dioic acid and glycol

  3. diamines and dicarboxylic acids

  4. propanoic acid and ethanol

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Correct Option: D
Explanation:

Propanoic acid and ethanol, both are monofunctional monomers $ CH _3-CH _2- OH , CH _3-CH _2COOH$ which are not suitable for a polycondensation reaction to take place because once they combine by condensation polemerisation further polymerisation is not possible.

Which of the following is not correct regarding terylene?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Step - growth polymer

  2. Synthetic fiber

  3. Condensation polymer

  4. Dacron

  5. Thermosetting plastic

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Correct Option: E

Which of the following is an example of condensation polymer?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Teflon

  2. Melamine

  3. Nylon-6

  4. BUNA-S

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Correct Option: B

Which of the following are condensation copolymers ?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Nylon - $6$

  2. Nylon - $6, :6$

  3. Dacron

  4. Glyptal

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Correct Option: B,C,D

Which of the following is a step-growth polymer ?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polyacrylonitrile

  2. Polyisoprene

  3. Nylon

  4. Polythene

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Correct Option: C
Explanation:

Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long-chain polymers. 


For example, Nylon polymerizes by the step-growth polymerization process in which difunctional monomers containing equal parts of amine and carboxylic acid react so that amides are formed at both ends of each monomer 
Polyacrylonitrile, Polyisoprene and Polythene polymerize by chain-growth polymerization of acrylonitrile, isoprene ($2$-methyl-$1,:3$-butadiene) and ethene, respectively. 

Chain-growth polymerization (or addition polymerization) involves the linking together of molecules incorporating double or triple carbon-carbon bonds.

Polymer formation form monomers starts by:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. condensation reaction between monomers

  2. conversion of monomer to monomer ions by protons

  3. coordination reaction between monomers

  4. hydrolysis of monomers

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Correct Option: A
Explanation:

Polymerization occurs by a condensation reaction, which is a chemical reaction in which two molecules or moieties (functional groups) combine to form a larger molecule, together with the loss of a small molecule such as water, HCl etc.

Option A is correct.

Nylon is made by

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. polymerization of polymers

  2. polymerization of monomers

  3. condensation co-polymers

  4. hydrolysis of polymer

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Correct Option: C

Polythene is a polymer. The monomer of this is:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Propene

  2. Isoprene

  3. Chloroprene

  4. Ethene

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Correct Option: D
Explanation:

Polythene is a polymer made from the monomer-ethene.

$nH _2C=CH _2 \xrightarrow {polymerization} -[H _2C-CH _2]- _n$
  (ethene)                                                 (polythene)

Fishing nets are made of

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. rayon

  2. dacron

  3. nylon

  4. viscose rayon

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Correct Option: C
Explanation:

Nylon is strong enough to bear heavy weights, extend and then regain its original shape and length, making it very resourceful in fishing nets and also durable.

The polymer formed by condensation of adipic acid and hexamethylene diamine is:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Isoprene

  2. Rayon

  3. Terylene

  4. Nylon-$6, 6$

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Correct Option: D