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Copolymerisation - class-XII

Description: copolymerisation
Number of Questions: 19
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Tags: polymers chemistry polymer
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Teflon and Neoprene are the example of:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. copolymer

  2. monopolymer

  3. homopolymer

  4. condensation polymer.

Show answer
Correct Option: B,C
Explanation:

Teflon is homopolymer of monomeric units of tetra-fluoro-ethene

$CF _2=CF _2$
Neoprene is homopolymer of monomeric units of chloroprene [ $2-chloro-1,3-butadiene$].
so these are homopolymer and monomers, correct option is [B,C].

Which of the following sets contain only addition homopolymers?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Polythene, Natural rubber, Cellulose

  2. Nylon, Polyester, Melamine resin

  3. Teflon, Bakelite, Orlon

  4. Neoprene, PVC, Polythene

Show answer
Correct Option: A,D
Explanation:

On the basis of mode of polymerization, polymers can be classified into two types:-

[1] Addition polymer
[2] Condensation polymer
Addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds. However, the addition polymers formed by the polymerization of a single monomeric species are known as homopolymers.
Example= Polythene: Made from the polymerization of ethene
Natural rubber: Made from the polymerization of cis-1,4-polyisoprene
Cellulose: Made from the polymerization of $\beta$ D- glucose
Neoprene: Made from the polymerization of chloroprene
PVC: Made from the polymerization of vinyl chloride

On complete hydrogenation, natural rubber produces:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. ethylene-propylene copolymer

  2. vulcanized rubber

  3. polypropylene

  4. polybutylene

Show answer
Correct Option: A
Explanation:

Natural rubber forms due to polymerisation of isoprene and on hydrogenation provide a polymer of the ethylene-propylene copolymer.


Hence, option A is correct.

Polymerisation in which two or more chemically different monomers take part is called 

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. addition polymerisation

  2. copolymerisation

  3. chain polymerisation

  4. homopolymerisation

Show answer
Correct Option: B
Explanation:

Addition polymerisation - In this type of polymerisation, the molecules of the same monomer or different monomers add together on a large scale to form a polymer.
Copolymerisation - Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric species is allowed to polymerise to form a copolymer.
Chain polymerisation - Chain polymerisation or chain growth polymerisation is a polymerisation technique, where unsaturated monomer molecules add on to the active site on a growing polymerisation one at a time.
Homopolymerisation - Homopolymerisation is the polymerisation of a single type of monomer to form a homopolymer.

Buna-S is a copolymer of:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. styrene and $1,:3$ - butadiene

  2. styrene and ethylene

  3. $1,:3$ - butadiene and ethylene

  4. $1,: 3$ - butadiene and acrylonitrile

Show answer
Correct Option: A
Explanation:

Buna-S is formed from styrene and $1,:3$ - butadiene.
The reaction is shown below:
$nCH _2=CH-CH=CH _2 + nC _6H _5CH=CH _2 \rightarrow -(CH _2-CH=CH-CH _2-CH _2-CH(C _6H _5)) _n-$

Which one of the following is an example of co-polymer ?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Buna - S

  2. Teflon

  3. PVC

  4. Polypropylrnr

Show answer
Correct Option: A
Explanation:

Copolymer is a polymer made of two or more than two different monomers.

Buna-S is made of $1,3-$butadiene and styrene monomer.
But others are made of single polymer only.
Teflon $\longrightarrow$ Tetrafluorocarbon.
PVC $\longrightarrow$ Vinyl Chloride.
Polypropylene $\longrightarrow$ Propylene.

Which of the following is not addition copolymer?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Saran

  2. Vinyon

  3. SBR

  4. PVC

Show answer
Correct Option: B

Which one is not a synthetic rubber?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Buna -S

  2. Homopolymers of 1, 3-butadiene derivative

  3. PVC

  4. Copolymer of 1, 3-butadiene

Show answer
Correct Option: B

Caprolactam is the monomeric unit of :

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Nylon 6, 6

  2. Nylon 2-Nylon 6

  3. Nylon 6

  4. None of these

Show answer
Correct Option: C
Explanation:
Nylon 6 is made from one kind of monomer called caprolactam. 

Nylon 6,6 is made from two monomers, adipoyl chloride and hexamethylene diamine.

Nylon 2–Nylon 6 is a copolymer of glycine and amino caproic acid. 

Polyethylene is a/an:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. random co-polymer

  2. homopolymer

  3. alternate co-polymer

  4. cross-linked co-polymer

Show answer
Correct Option: B

Which of the following represents the example of a homopolymer ?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. PMMA

  2. Bakelite

  3. Nylon - $6,:6$

  4. Neoprene

Show answer
Correct Option: A,D
Explanation:

When a polymer is made by linking only one type of small molecule or monomer together, it is called a homopolymer, e.g. PMMA and Neoprene.


When two different types of monomers are joined in the same polymer chain, the polymer is called a co-polymer, e.g., Nylon - $6,:6$ and Bakelite.

Which of the following is a co-polymer ?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Polytetrafluoroethylene

  2. Polyvinyl chloride

  3. Polyethylene

  4. Nylon - $6, :6$

  5. Natural rubber

Show answer
Correct Option: D
Explanation:

A polymer derived from more than one species of monomer is a co-polymer e.g. Nylon - $6,:6$. 


All others are formed by following single monomers: 
Polytetrafluoroethylene - tetrafluoroethylene, 
Polyvinyl chloride - vinyl chloride, 
Polyethylene - ethylene and
 Natural rubber or polyisoprene - isoprene ($2$-methyl-$1,:3$-butadiene).

Silk worm : Cocoon :: Wool: ?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Hair of rabbit

  2. Cotton plant

  3. Fleece of sheep

  4. Jute of hemp

Show answer
Correct Option: C
Explanation:

Silk worm: Cocoon

This cocoon is formed by silkworm out of silk fibres.
Similarly, Wool is obtained from sheep's fleece which is a coat of wool.

Match column 1 with column 2


List I List II
1 PET a garden hoses, shoe soles
2 High-density polyethylene b soft drink bottles, detergent bottles
3 Poly vinyl chloride c squeeze bottles, dry cleaning bags
4 Low-density polyethylene d milk bottles, shopping bags

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. 1-d, 2-a, 3-b, 4-c

  2. 1-b, 2-d, 3-a, 4-c

  3. 1-c, 2-a, 3-b, 4-d

  4. 1-b, 2-c, 3-a, 4-b

Show answer
Correct Option: B
Explanation:

PET is a clear, tough polymer with exceptional gas and moisture barrier properties. PET's ability to contain carbon dioxide (carbonation) makes it ideal for use in soft drink bottles. 


HDPE is used in milk, juice and water containers in order to take advantage of its excellent protective barrier properties. 


PVC provides excellent clarity, puncture resistance and cling.

 LDPE offers clarity and flexibility. It is used to make bottles that require flexibility.


1-b, 2-d, 3-a, 4-c

Which of the following is an alternative copolymer?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Styrene

  2. Neoprene

  3. Nylon - $2$ - nylon - $6$

  4. Nylon - $6$

Show answer
Correct Option: C
Explanation:

Alternative polymers are those polymers which are formed by only two monomeric units which are alternatively arranged in polymeric chain Nylon - $2$ - nylon - $6$.
The formation is shown in the reaction below:
$HOOC-(CH _2) _4-COOH + H _2N-(CH _2) _2-NH _2 \rightarrow -[NH(CH _2) _2NHCO(CH _2) _4CO] _n- + nH _2O$

Orion and Acrilan are fibres of well-known textile materials of the same name. They are copolymers of:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. styrene and butadiene

  2. alcohol and ester

  3. acrylonitrile and 2-vinylpyridine

  4. methane and acetone

Show answer
Correct Option: C
Explanation:

Orlon is also known as polyacrylonitrile hence is the copolymer of acrylonitrile.

Acrilan is also a copolymer of acrylonitrile.

Vinylite resins are copolymers of vinyl acetate and vinyl chloride. They are resistant to wear and tear to chemicals. One of their well-known uses is in:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. floor coverings

  2. ropes

  3. tyres

  4. electrical insulators

Show answer
Correct Option: A
Explanation:

$\text{Vinylite resins are well known used in Floor coverings so that to resist chemicals from it.}$

Which of the following is not a homopolymer?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Butyl rubber

  2. Neoprene

  3. Natural rubber

  4. Nitrile rubber

Show answer
Correct Option: A,D
Explanation:
A homopolymer plastic is one that is produced by the polymerization of a single monomer.
Butyl rubber, sometimes just called "butyl", is a synthetic rubber, a copolymer of isobutylene with isoprene. 
Neoprene is a homopolymer of chlorobutadiene.
Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene).
Nitrile rubber, also known as Buna-N, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. 
Thus Butyl rubber and nitrile rubber are not homopolymers
Options A  and D are correct.

Which of the following polymers contains $1,: 3$-butadiene as one of the monomers ?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Butyl rubber

  2. Nitrile rubber

  3. ABS plastic

  4. SBR

Show answer
Correct Option: B,C,D
Explanation:
The polymers Nitrile rubber,  ABS plastic and SBR contains $1,\: 3$-butadiene as one of the monomers. 

Butyl rubber is copolymer of isobutylene and isoprene.  

Nitrile rubber (Buna - N) is copolymer of acrylonitrile and $1,\: 3$-butadiene.
 
ABS plastic is copolymer of $1,\: 3$-butadiene and acrylonitrile. 

SBR (Buna S) is copolymer of $1,\: 3$-butadiene and styrene.
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