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Types of polymerisation reactions - class-XII

Description: types of polymerisation reactions
Number of Questions: 23
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Tags: polymer chemistry polymers
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Formation of nylons and polyesters are called step growth polymerization because:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. the polymers are formed by adding a monomer step by step

  2. the polymers are formed by condensation and monomers are joined by loss of simple molecules like water

  3. the monomers used for condensation are unsaturated molecules

  4. the polymers are formed by addition of a large number of free radicals formed by monomers

Show answer
Correct Option: B
Explanation:
 These polycondensation reactions result in the loss of some simple molecules as water, alcohol, etc., and lead to the formation of high molecular mass condensation polymers.
let's look at the formation of nylon polymer
Nylon 6,6- It is prepared by the condensation polymerisation of hexamethylenediamine with adipic acid under high pressure and at high temperature with the removal of water molecules.
the correct option is [B].

Terylene is a condensation polymer of ethylene glycol and:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. benzoic acid

  2. phthalic acid

  3. terephthalic acid

  4. salicylic acid

Show answer
Correct Option: C
Explanation:

Terylene is a condensation polymer of ethylene glycol and terephthalic acid,

it is the product of condensation polymerisation, this type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers and lead to the formation of high molecular mass condensation polymers.
The correct option is [C].

Which of the following is not true about polymers?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polymers are high molecular mass macro-molecules.

  2. Polymers may be of natural or synthetic origin.

  3. Condensation polymers are made up of one type of monomers only.

  4. They have high viscosity and do not carry any charge.

Show answer
Correct Option: C
Explanation:

A) Polymers are high molecular mass macro-molecules made with a large number of repeating subunits.

B) Naturally occurring polymers - Silk, Wool, DNA, etc.
Synthetic polymers- Nylon, Polyethylene, Polyester etc. 
C) Two bi-functional monomers are used in condensation polymerisation,
Example Nylon-6,6 is the polymer of Hexamethylenediamine + adipic acid

So this statement is false.

D) Polymers are large chain molecules so they have high viscosity. Since monomers of polymers are neutral, the overall polymer is also neutral.

$X-(CH _2) _4-X \xrightarrow [{HOOC-(CH _2) _4-COOH}] {Y}:Condensation : Polymer$


The correct functional group $X$ and the reagent/reaction conditions $Y$ in the following scheme are:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. $X=COOCH _{3},\ Y=H _{2}/Ni/heat$

  2. $X=CONH _{2},\ Y=H _{2}/Ni/heat$

  3. $X=CONH _{2},\ Y=Br _{2}/NaOH$

  4. $X=CN,\ Y=H _{2}/Ni/heat$

Show answer
Correct Option: C,D

 Which of the following is condensation polymer? 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polypropylene

  2. PMMA

  3. Glyptal

  4. Teflon

Show answer
Correct Option: A

Synthetic fiber does not obtained from renewable resources is : 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Nylon

  2. Polyester

  3. Rayon

  4. Acrylic

Show answer
Correct Option: C
Explanation:

Synthetic fibres are manufactured using plant materials and minerals. 


Viscose comes from pine trees or petrochemicals, while acrylic, nylon and polyester come from oil and coal. 

Viscose fibre is obtained from the cellulose; versatility allows imitating materials such as cotton or silk.

Rayon is a manufactured fiber made from natural sources such as wood and agricultural products that are regenerated as cellulose fiber. 

The many types and grades of rayon can imitate the feel and texture of natural fibers such as silk, wool, cotton, and linen.

Therefore, option C is correct.

Regenerated fibres have superior physical properties because

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. they are fresh fibres

  2. they are obtained naturally

  3. they are chemically treated fibres

  4. None of the abvoe

Show answer
Correct Option: C
Explanation:

Regenerated fibre is created by dissolving the cellulose area of plant fibre in chemicals and making it into fibre  again.It consists of cellulose like cotton and hemp  so it is called as regenerated cellulose fibre.

Bakelite is formed by:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. polymerization of phenol and formaldehyde

  2. polymerization of alcohol and acetaldehyde

  3. condensation of phenol and formaldehyde

  4. condensation of phenol and acetaldehyde

Show answer
Correct Option: C
Explanation:

Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde.


Hence, option C is correct.

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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-$6, 6$

Show answer
Correct Option: D

Hair sprays generally contain resins in a volatile solvent. Upon drying, they leave a thin film that holds the hair in place. Which of the following is a resin used in hair spray?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polyester

  2. Polyvinyl alcohol

  3. Polyvinyl pyrrolidone (PVP)

  4. Polythene

Show answer
Correct Option: C
Explanation:
$PVP$ (Polyvinyl pyrrolidone) is a versatile ingredient which is used in cosmetics and beauty industry as a bindes, film former, emulsion stabilizer, suspending agent and hair fixative used in products like mascara, eyeliner, hair conditioners, hair sprays and shampoos.

Which of the following polymers can be made by condensation polymerisation reaction?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Dacron

  2. Nylon - $6,: 6$

  3. Bakelite

  4. Polyethylene

Show answer
Correct Option: A,B,C
Explanation:

Condensation polymers are formed by repeated condensation reactions between two different bi-functional or tri-functional monomeric units. In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. takes place. 

Dacron, Nylon-6.6 and Bakelite are produced by condensation polymerisation.

On the other hand, Polyethylene is formed by breakage of the double bond and there is no elimination of molecules.


Which of the following is/are not a condensation copolymer?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Nylon-$6$

  2. Nylon-$6,6$

  3. Dacron

  4. PVC

Show answer
Correct Option: A,D
Explanation:
The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylenediamine with adipic acid.

When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. 
Nylon 6 is a condensation polymer but it's not a co-polymer.
PVC is an addition polymer.

Hence, options A and D are correct.

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of: 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. caprolactum

  2. hexamethylene diamine and adipic acid

  3. $6$-aminohexanoic acid

  4. acrylonitrile

Show answer
Correct Option: A
Explanation:

Solution:- (A) Caprolactam

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of caprolactam.
$n \left( \text{Caprolactum} \right) \xrightarrow[{N} _{2}]{533 \; K} \text{Nylon}-6$

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