alternate cis- and trans-configuration

random cis-and trans-configuration

$$3$$-methyl-$$1, 2$$-butadiene

$$3$$-chloro-$$1, 2$$-butadiene

MCQ Questions for Class 12 Engineering Chemistry Polymers Quiz 4

Identify the type of polymer.
(i) - A - A - A - A - A - A-
(ii) - A - B - B - A - A - A - B - A -

0%
(i) Homopolymer, (ii) Copolymer
0%
(i) Natural polymer, (ii) Synthetic polymer
0%
(i) Linear polymer, (ii) Branched polymer
0%
(i) Fibre, (ii) Elastomer

Which of the following are example of synthetic rubber?

0%
Polychloroprene
0%
Polyacrylonitrile
0%
Buna $-N$
0%
cis-polyisoprene

Explanation

Synthetic rubbers are either homopolymers of

$1,3-$ butadiene derivatives or copolymers of

$1,3-$ butadiene or its derivatives with another unsaturated monomer.

Polymers are often gigantic molecules consisting of long chains of repeating chemical-units. Which of the following is not a polymer?

0%
Rubber
0%
Cellulose
0%
Protein
0%
Glucose

Neoprene is a polymer made by using acetylene as a raw material. It is used as:

0%
rubber in diving suits
0%
plastic for car panels
0%
plastic for dining tables
0%
material for electrical switches

The S in buna-S refers to:

0%
sulphur
0%
styrene
0%
sodium
0%
salicylate

Explanation

The

$S$ in buna-

$S$ refers to styrene, it is ethenylbenzene as shown in the above image. Buna-

$S$ and buna-

$N$ both are the types of synthetic rubbers. The correct option is

$[B]$ .

The cross-linked polymer(F) is:

0%
Resol
0%
Novolac
0%
Bakelite
0%
Decron

Non-stick frying pans are coated black with Teflon, a material that is resistant to heat. Teflon is a polymer of:

0%
fluoromethane
0%
styrene
0%
ethylene
0%
tetrafluoroethylene

Explanation

Teflon is a polymer of tetrafluoroethylene

$\left({C}_{2}{F}_{4} \right)$ , also known as polytetrafluoroethylene. It is a manmade polymer that has particular applications in manufactured products because of the chemical properties of Polytetrafluoroethylene.

The commercial name of polyacrylonitrile is

0%
Dacron
0%
Orion
0%
$PVC$
0%
Bakelite

Which of the following statements is wrong ?

0%
PVC stands for polyvinyl chloride.
0%
PTFE stands for teflon
0%
PMMA stands for polymethyl methyl acrylate
0%
Buna-S stands for natural rubber.

Teflon and Neoprene are the example of:

0%
copolymer
0%
monopolymer
0%
homopolymer
0%
condensation polymer.

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].

When cellulose from wood or cotton is cooked in large tanks containing caustic soda and then through a narrow slit into another tank containing acid, we get:

0%
cellophane, a paper-like plastic
0%
rayon, a textile fibre
0%
bakelite, an insulator
0%
unvulcanized rubber

Plywood sheets are stuck together by unpolymerized:

0%
nylon
0%
carbon black
0%
urea-formaldehyde resins
0%
styrene and butadiene

Explanation

$\begin{array}{l} \text { Plywood sheets are stuck together by unpolymerized } \\ \text { urea- formaldehyde resins. } \\ \text { It involves the extensive use for bonding of sheets of } \\ \text { plywood, paper, clothes etc. } \end{array}$

Which of the following is a monomer of natural rubber?

0%
Chloroprene
0%
Caprolactam
0%
Urea
0%
None of these

Bakelite is an example of:

0%
elastomer
0%
fibre
0%
thermoplastic
0%
thermosetting polymer

Explanation

Bakelite is an example of a thermosetting polymer and also a type of phenol-formaldehyde polymers. These are obtained by the condensation reaction of phenol with formaldehyde in the presence of either an acid or a base catalyst. The reaction starts with the initial formation of

$o-$ and/or

$p-$ hydroxymethyl phenols derivatives, which further react with phenol to form compounds having rings joined to each other through

$-CH_2$ groups.

Which of the following is a natural polymer ?

0%
Poly (Butadiene-styrene)
0%
Polybutadiene
0%
Poly (Butadiene-acrylonitrile)
0%
cis-1,4-polyisoprene

Terylene is a condensation polymer of ethylene glycol and:

0%
benzoic acid
0%
phthalic acid
0%
terephthalic acid
0%
salicylic acid

Composition of Ziegler-Natta catalyst is:

0%
$({ Et }_{ 3 })_{ 3 }Al. { Ti }{ Cl }_{ 2 }$
0%
$\left( Me \right) _{ 3 }Al. { Ti }{ Cl }_{ 2 }$
0%
$\left( Et \right) _{ 3 }Al. { Ti }{ Cl }_{ 4 }$
0%
$\left( Et \right) _{ 3 }Al. { Pt }{ Cl }_{ 4 }$

Synthetic polymer prepared by using caprolactam is known as:

0%
terylene
0%
teflon
0%
nylon-6
0%
neoprene

Which of the following is a condensation polymer?

0%
Teflon
0%
PVC
0%
Polyester
0%
Neoprene

Explanation

Polyester is a type of condensation polymer, This type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers. These polycondensation reactions may result in the loss of some simple molecules like water, alcohol, etc and lead to the formation of high molecular mass condensation polymers.

Example = Dacron, Glyptal.

Hence, the correct option is

$[C]$ .

Bakelite is obtained from phenol by reaction with:

0%
$HCHO$
0%
$(CH_{2}OH)_{2}$
0%
$CH_{3}CHO$
0%
$CH_{3}COCH_{3}$

Low-density polyethene (LDP) is used in the insulation of electricity carrying wires and manufacture of flexible pipes and squeeze bottles because:

0%
it is tough, hard and rigid
0%
it is chemically inert, tough, flexible and poor conductor of electricity
0%
it is very tough, good conductor of electricity and flexible
0%
it is chemically inert, very soft, water absorbent and poor conductor of heat

Explanation

Method of the preparation of low-density polythene-

It is obtained by the polymerisation of ethene under high pressure of

$1000$ to

$2000$ atmospheres at a temperature of

$350 K$ to

$570 K$ in the presence of traces of dioxygen or a peroxide initiator (catalyst). The low-density polyethene (LDP) obtained through the free radical addition and H-atom abstraction has highly branched structure. Low-density polyethene is chemically inert and tough but flexible and a poor conductor of electricity.

The correct option is [B].

Formation of nylons and polyesters are called step growth polymerization because:

0%
the polymers are formed by adding a monomer step by step
0%
the polymers are formed by condensation and monomers are joined by loss of simple molecules like water
0%
the monomers used for condensation are unsaturated molecules
0%
the polymers are formed by addition of a large number of free radicals formed by monomers

Which of the following is not true about high density polythene?

0%
Tough
0%
Hard
0%
Inert
0%
Highly branched

Which polymer has 'chiral' monomer(s)?

0%
$PHBV$
0%
Nylon $6,6$
0%
Buna $-N$
0%
Neoprene

Which of the following polymers is synthesized using a free radical polymerization technique?

0%
Terylene
0%
Melamine polymer
0%
Nylon 6,6
0%
Teflon

Explanation

Teflon is synthesized using a free radical (addition or chain growth) polymerization technique.

$\displaystyle$
Terylene, Melamine polymer and Nylon 6,6 are synthesized using condensation (step-growth) polymerization technique.

$\displaystyle \underset { \displaystyle \text {Tetrafluoroethylene (monomer) } }{nCF_2=CF_2} \xrightarrow { \displaystyle \text {Vinyl Polymerisation, }\text{free radical} } \underset { \displaystyle \text { Teflon (polymer)} }{(-CF_2-CF_2-)_n}$

Hence, the correct option is

$D$

Preparation of Bakelite proceeds via reactions :

0%
Electrophilic substitution and dehydration
0%
Electrophilic addition and dehydration
0%
Nucleophilic addition and dehydration
0%
Condensation and elimination

Which of the following is a biodegradable polymer?

0%
$-\!\!\![\,HN-(CH_2)_6NHCO-(CH_2)_4-\overset{O}{\overset{||}C}\,]\!\!\!-_n$
0%
$-\!\!\![\,HN-(CH_2)_5-\overset{O}{\overset{||}C}]\!\!\!-_n$
0%
0%
$-\!\!\![\,HN-(CH_2)_5CONH-CH_2-\overset{O}{\overset{||}C}\,]\!\!\!-_n$

Explanation

The polymer shown in option (D) is a biodegradable polymer. This polymer is known as

$\text{Nylon-2-nylon-6}$ . It is a copolymer of

$\text{glycine}$ and

$\text{w-amino caproic acid}$ . It contains polyamide linkages.

Hence, option D is correct.

0%
Both assertion and reason are correct and the reason is the correct explanation for the assertion
0%
Both assertion and reason are correct but the reason is not the correct explanation for the assertion
0%
Assertion is incorrect statement but the reason is correct
0%
Both assertion and reason are incorrect

Choose the correct options(s) from the following.

0%
Teflon is prepared by heating tetrafluoroethene in presence of a persulphate catalyst at high pressure
0%
Natural rubber is polyisoprene containing trans alkene units
0%
Nylon-6 has amide linkages
0%
Cellulose has only $\alpha-D-glucose$ units that are joined by glycosidic linkages.

Which one of the following structures represents the neoprene polymer?

Explanation

The structure of the neoprene polymer is as shown below.
It is obtained from chloroprene which is

$2$ -chloro buta-

$1,3$ -diene. It is an addition homopolymer with rubber like structure and properties.

On complete hydrogenation, natural rubber produces :

0%
ethylene-propylene copolymer
0%
vulcanised rubber
0%
polypropylene
0%
polybutylene

Explanation

Explanation:

Natural rubber is formed by the polymerization reaction of Isoprene $(2-Methylbuta-1,3-diene)$ .
The formation follows an electrophilic addition mechanism.
On hydrogenation of rubber (polymer), the double bond break and two different monomers ethylene and propylene are produced. These are called copolymers.
The reaction is as follows:

Hence, option $A$ is the correct answer.

Natural rubber has:

0%
all cis-configuration
0%
all trans-configuration
0%
alternate cis- and trans-configuration
0%
random cis-and trans-configuration

Nylon is an example of:

0%
polyester
0%
polysaccharide
0%
polyamide
0%
polythene

Explanation

Nylon is an example of Polyamide.

For example, Nylon-

$6,6$ is a copolymer of adipic acid

$[HOOC-(CH_2)_4-COOH]$ and hexamethylenediamine

$[H_2N-(CH_2)_6-NH_2]$ .

It is a polyamide represented as

$[-CO-(CH_2)_4-CO-NH_-(CH_2)_6-NH-]_n$ .

Which one of the following sets forms the biodegradable polymer?

0%
${H}_{2}N-{CH}_{2}-COOH$ and ${H}_{2}N-{({CH}_{2})}_{5}-COOH$
0%
$HO-{CH}_{2}-{CH}_{2}-OH$ and $COOH-C_6H_4-COOH$
0%
$C_6H_5-CH=CH_2$ and ${CH}_{2}=CH-CH={CH}_{2}$
0%
${CH}_{2}=CH-CN$ and ${CH}_{2}=CH-CH={CH}_{2}$

Explanation

The condensation polymerization of

${H}_{2}N-{CH}_{2}-COOH$ and

${H}_{2}N-{({CH}_{2})}_{5}-COOH$ forms Nylon-2-Nylon-6 which is a bio-degradable polymer. It can be degraded by microorganisms like bacteria fungi, etc. which are present in the environment. It is non-toxic and non-polluting.

In options B, C and D, the condensation polymerisation of monomers results in the formation of non-biodegradable polymers.

Hence, option A is correct.

Isoprene is:

0%
$3$ -methyl- $1, 2$ -butadiene
0%
$2$ -methyl- $1, 3$ -butadiene
0%
$3$ -chloro- $1, 2$ -butadiene
0%
$2$ -chloro- $1, 3$ -butadiene

Explanation

$H_2C=\underset{\underset {\displaystyle {\,\,\,\,CH_3}} |}{C}-CH=CH_2$

Isoprene is a monomer of natural rubber. Its formula is

$2$ -methyl-

$1,3$ -butadiene.

Polymer used in bullet proof glass is:

0%
lexan
0%
PMMA
0%
nomex
0%
kevlar

Polymer obtained by condensation polymerization is :

0%
polythene
0%
teflon
0%
PVC
0%
bakelite

Neoprene is:

0%
Polyster
0%
Polyamide
0%
Polysaccharide
0%
Polyhalodiene

$CH_{2}= CH_{2}$ is a ___.

0%
monomer
0%
polymer
0%
isomer
0%
equimer

Explanation

$CH_2=CH_2$ is a monomer. Large number of ethylene monomeric units combine together forming a polymer called polyethylene.

The process of vulcanization was introduced by ____

0%
Charles Goodyear
0%
Kolbe
0%
Wohler
0%
Zeigher

Explanation

Charles Goodyear invented vulcanization process in

$1839$ .
Vulcanisation is a process involving heating of rubber with sulphur is called vulcanisation.

The S in Buna- S refers to:

0%
sulphur
0%
styrene
0%
sodium
0%
just a trade name

Buna-S is a copolymer of:

0%
styrene and $1,\:3$ - butadiene
0%
styrene and ethylene
0%
$1,\:3$ - butadiene and ethylene
0%
$1,\: 3$ - butadiene and acrylonitrile

Explanation

Buna-S is formed from styrene and

$1,\:3$ - butadiene.
The reaction is shown below:

$nCH_2=CH-CH=CH_2 + nC_6H_5CH=CH_2$

$\downarrow$

$-(CH_2-CH=CH-CH_2-CH_2-CH(C_6H_5)-CH_2)_n-$

Among the following a natural polymer is:

0%
Cellulose
0%
PVC
0%
Teflon
0%
Polyethylene

Explanation

Cellulose is an organic compound with the formula

$(C_6H_{10}O_5)_n$ , a polysaccharide.

It is found on the wall of green plants, many forms of algae and some species of bacteria secrete it to form biofilms. Hence, it is a natural polymer.

Polyvinyl chloride (PVC) is synthesized from vinyl chloride monomer.

Teflon is a polymer, which is made by joining together lots of smaller molecules of tetrafluoroethylene (TFE).

Polyethylene or polythene is the most common plastic made from ethylene.

Hence, option

$A$ is correct.

Which of the following are co-polymers?

0%
Bakelite
0%
Melamine
0%
Buna-S
0%
Nylon-6,6

Natural rubber is which type of polymer?

0%
Condensation polymer
0%
Addition polymer
0%
Co-ordination polymer
0%
None of these

Explanation

Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree. Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene). Since isoprene has two double bonds, it still retains one of them after the polymerization reaction.

Hence, option

$B$ is correct.

Polythene is:

0%
Thermoplastic
0%
Thermosetting
0%
Both (a) and (b)
0%
None of these

Explanation

A thermoplastic is a material, usually, a plastic polymer, which becomes softer when heated and hard when cooled.

Polyethylene (PE) is the most widely used thermoplastic polymer for fabricated parts and components.

Hence, option

$A$ is correct.

Which of the following is Teflon

0%
$[ -CF_2 - CF_2 - ]_n$
0%
$CF_2 = CF_2$
0%
$CF \equiv CF$
0%
None of these

The above shown polymer is obtained when a carbon compound is allowed to stand. It is a white solid. The polymer is

0%
Trioxane
0%
Formose
0%
Paraformaldehyde
0%
Metaldehyde

Natural rubber is:

0%
Polyester
0%
Polyamide
0%
Polyisoprene
0%
Polysaccharide

Explanation

Natural rubber also called by other names of India rubber, latex consists of polymers of the organic compound isoprene.

Hence, natural rubber is polyisoprene.

The answer is option

$C$ .

Example of formation of polymer is.

0%
Formaldehyde $\rightarrow$ meta-formaldehyde
0%
Acetaldehyde $\rightarrow$ para-aldehyde
0%
Acetone $\rightarrow$ mesityl oxide
0%
Ethene $\rightarrow$ polyethene

Explanation

Polyethene is a polymer synthesized from ethene by addition polymerization.

The answer is option

$D$ .

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 4 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 4 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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