Match the column I with column II and mark the appropriate choice. Column I Column II (A) Raincoats, hand bags (i) PHBV (B) Laminated sheets (ii) PVC (C) Television cabinets (iii) Urea-formaldehyde resin (D) Orthopaedic devices (iv) Polystyrene

(A) $$\rightarrow$$ (ii), (B) $$\rightarrow$$ (iii), (C) $$\rightarrow$$ (iv), (D) $$\rightarrow$$ (i)

(A) $$\rightarrow$$ (i), (B) $$\rightarrow$$ (ii), (C) $$\rightarrow$$ (iii), (D) $$\rightarrow$$ (iv)

(A) $$\rightarrow$$ (iv), (B) $$\rightarrow$$ (i), (C) $$\rightarrow$$ (ii), (D) $$\rightarrow$$ (iii)

(A) $$\rightarrow$$ (iii), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$ (i), (D) $$\rightarrow$$ (ii)

MCQ Questions for Class 12 Engineering Chemistry Polymers Quiz 11

PDI for natural polymers is generally close to:

0%
zero
0%
$1$
0%
$10$
0%
$100$

Explanation

PDI abbreviates as polydispersity index of polymer.

$PDI=\displaystyle\frac{\bar{M_w}}{M_n}$

For natural polymers,

$PDI=1$
and for synthesis polymers,

$PDI>1$ .

Hence, option B is correct.

What is not true regarding free radical polymerisation of propene?

0%
Without proper control, atactic polypropylene is formed
0%
Use of Ziegler-Natta catalyst results in isotactic polypropylene
0%
During polymerisation, a linear unbranched, crystalline polymer is usually obtained
0%
During polymerisation, a secondary free radical is produced in every step

Explanation

The statement (C) is not true. During polymerization, a branched polymer is usually obtained . Chain branching always occur during olefenic polymerization due to abstraction of some H-radical from the growing polymer chain.

Note:

$\displaystyle 1^o$ free radical forms

$\displaystyle 2^o$ free radical by abstracting hydrogen at middle of another chain, which further adds to propene and there is growing of the branch. Ziegler Natta catalyst is titanium chloride and triethyl aluminum

$\displaystyle [TiCl_4+ Al(C_2H_5)_3]$

Which one of the following is not an example of chain growth polymer?

0%
Neoprene
0%
Buna-S
0%
PMMA
0%
Glyptal

Which of the following is a monomer of teflon?

0%
Difluoroethane
0%
Trifluoroethane
0%
Tetrafluoroethane
0%
None of these

Explanation

Teflon is an addition polymer of tetrafluoroethylene.

$\underset {\text{tetrafluoroethylene}}{ n{ F }_{ 2 }C=C{ F }_{ 2 } } \xrightarrow [ \text{Pressure}]{ \text{Heat}} \underset { \text{teflon} }{ -{ ({ F }_{ 2 }C-C{ F }_{ 2 })- }_{ n } }$

It is used to make non-sticky utensils.

In the reaction sequence, (X) is:

0%
cyclohexanone
0%
caprolactum
0%
$HO(CH_2)_6NH_2$
0%
hexamethylene disocyanate

Natural rubber is not used in making footwear for polar regions because:

0%
natural rubber becomes soft at temperature lower than ${ 10 }^{ o }C$
0%
natural rubber becomes brittle at temperature lower than ${ 10 }^{ o }C$
0%
natural rubber melts at temperature lower than ${ 10 }^{ o }C$
0%
natural rubber becomes stronger at temperature lower than ${ 10 }^{ o }C$

Explanation

Natural rubber is a thermoplastic. It becomes soft and sticky when heated at high temperature (lower than

${ 62 }^{ o }C$ ) and brittle at low temperature

$\left( { 10 }^{ o }C \right)$ . So that's why natural rubber is not used in making footwear for the polar region.

Which of the following pair of monomers is used in preparation of PHBV ?

0%
$\beta -$ hydroxy valeric acid, amino caproic acid
0%
$\beta -$ hydroxy butyric acid, $\beta -$ hydroxy valeric acid
0%
$\beta -$ hydroxy butyric acid, adipic acid
0%
Lactic acid, adipic acid

Explanation

PHBV (poly

$\beta$ -hydroxy butyrate -

$CO-\beta-$ hydroxy valerate) is a biodegradable copolymer of

$\beta$ -hydroxy butyric acid and

$\beta$ -hydroxy valeric (or pentanoic) acid.

The monomers of BUNA-S rubber is:

0%
vinyl chloride and sulphur
0%
butadiene
0%
styrene and butadiene
0%
isoprene and butadiene

Explanation

Monomers of BUNA-S:

$1,3-$ butadiene and styrene
1157029_672797_ans_e28e126a95234ff3a772c100da1353ac.PNG

Which compound polymerises to neoprene?

0%
${ CH }_{ 2 }=CHCl$
0%
${ CH }_{ 2 }=CCl-CH={ CH }_{ 2 }$
0%
${ Cl }_{ 2 }C=C{ Cl }_{ 2 }$
0%
${ F }_{ 2 }C={ CF }_{ 2 }$

Bakelite is obtained from phenol by reacting with:

0%
$(CH_2OH)_2$
0%
$CH_3CHO$
0%
$CH_3COCH_3$
0%
$HCHO$

Explanation

Bakelite was the first plastic made from synthetic components. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol

$(C_6H_5OH)$ with formaldehyde

$(HCHO)$ .

Hence, option D is correct.

Which polymer is used in controlled drugs capsules?

0%
$SBR$
0%
$PTFE$
0%
$PHBV$
0%
$PAN$

Teflon is most commonly used in:

0%
making water pipes and electrical cable insulation
0%
blankets and clothing
0%
non-sticky coating
0%
latex paints and adhesives

Which of the following fibres is made of polyamides?

0%
Dacron
0%
Orion
0%
Nylon
0%
Rayon

Explanation

Nylon is a generic designation for a family of synthetic polymers, based on aliphatic or semi-aromatic polyamides.

Nylon is a thermoplastic silky material that can be melt-processed into fibers, films, or shapes.

$Nylon-66$ &

$nylon-6$ are examples of condensation polymers made of polyamides.

Hence, option C is correct.

Which of the following is/are true statement(s) for the preparation of Teflon?

0%
It is produced by condensation polymerization
0%
Water acts as catalyst
0%
The monomer used is tetrafluoroethane
0%
The monomer is obtained from carbon tetrachloride

Match the polymers given in column I with the monomers in column II and mark the appropriate choice.

0%
(A) $\rightarrow$ (ii), (B) $\rightarrow$ (i), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (iv)
0%
(A) $\rightarrow$ (iii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (i), (D) $\rightarrow$ (ii)
0%
(A) $\rightarrow$ (i), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (iv)
0%
(A) $\rightarrow$ (iv), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (i)

Explanation

$\underset{Hexamethylenediamine }{NH_2 - (CH_2)_6 - NH_2} + \underset{Adipic\, acid}{COOH - (CH_2)_6 - COOH} \longrightarrow \underset{Nylon\, 6,6}{-\!\!\!(\overset{\displaystyle H}{\overset{|}{N}} - (CH_2)_6 -\overset{\displaystyle H}{\overset{|}{N}} - \overset {\overset{\displaystyle O}{||}}{C}- (CH_2)_4 -\overset{\displaystyle O}{\overset{||}{C}} -\!\!\!\!)_n}$

$\underset{Urea}{NH_2-CO - NH_2} + \underset{Formaldehyde}{HCHO} \longrightarrow \underset{Urea + formaldehyde}{-\!\!\!(NH - CO - NH - CH_2 -\!\!\!)_n}$

1379932_936940_ans_aa22187195f440a8a32602c6d0abf654.png

Which among the following is a cross-linked polymer?

0%
Polyesters
0%
Glycogens
0%
Melamine-formaldehyde
0%
Polyvinyl chloride

Heating rubber with sulphur is known as:

0%
galvanization
0%
bessemerisation
0%
vulcanization
0%
sulphonation

Natural rubber is a polymer of:

0%
1, 1-dimethylbutadiene
0%
2-methyl-1, 3-butadiene
0%
2-chlorobuta-1, 3-diene
0%
2-chlorobut -2-ene

Explanation

Natural rubber (poly cis-isoprene) is the polymer of

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

Rubber is a natural polymer and possesses elastic properties. It is also termed as elastomer and has a variety of uses. It is manufactured from rubber latex which is a colloidal dispersion of rubber in water.

The correct option is [B].

In vulcanization of rubber :

0%
sulphur reacts to form a new compound
0%
sulphur cross-links are introduced
0%
sulphur forms a very thin protective layer over rubber
0%
all statements are correct

Explanation

Vulcanisation of rubber-

To improve these physical properties,

Strength
Resistance for oxidation
Repulsion from water

a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between

$373 K to 415 K.$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.

The correct option is [B].

Which of the following is not an example of rubber?

0%
Polychloroprene
0%
Buna-N
0%
Butadiene-styrene copolymer
0%
Polyacrylonitrile

Buna-N is used in making oil seals and tank linings, etc. because:

0%
it is resistant to the action of lubricating oil and organic solvents
0%
it is more elastic than natural rubber
0%
it can be stretched twice its length
0%
it does not melt at high temperatures

Explanation

Properties of Buna

$-N$

It is resistant to the action of petrol, lubricating oil and organic solvents,

Uses-

Making oil seals
Tank lining.

The correct option is [A].

Which of the following is not true about polymers?

0%
Polymers are high molecular mass macro-molecules.
0%
Polymers may be of natural or synthetic origin.
0%
Condensation polymers are made up of one type of monomers only.
0%
They have high viscosity and do not carry any charge.

Which of the following polymers does not involve cross-linkages?

0%
Vulcanised rubber
0%
Bakelite
0%
Melamine
0%
Teflon

0%
trans 1, 4 configuration
0%
cis 1, 4 configuration
0%
both cis and trans 1, 4 configuration
0%
none of these

Which of the following is not a semi-synthetic polymer?

0%
Cis-Polyisoprene
0%
Cellulose nitrate
0%
Cellulose acetate
0%
Vulcanized rubber

Which of the following is monomer of the given polymer?

Few polymers are matched with their uses. Point out the wrong match.

0%
Polyester - Fabric, tyre cords, safety belts
0%
Nylon 6 - Ropes, tyre cords, fabrics
0%
Bakelite - Packaging industry, lubricant
0%
Teflon - Oil seals, gaskets, non-stick utensils

On complete hydrogenation, natural rubber produces:

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

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Raincoats, hand bags	(i)	PHBV
(B)	Laminated sheets	(ii)	PVC
(C)	Television cabinets	(iii)	Urea-formaldehyde resin
(D)	Orthopaedic devices	(iv)	Polystyrene

0%
(A) $\rightarrow$ (i), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (iv)
0%
(A) $\rightarrow$ (iv), (B) $\rightarrow$ (i), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (iii)
0%
(A) $\rightarrow$ (ii), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (iv), (D) $\rightarrow$ (i)
0%
(A) $\rightarrow$ (iii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (i), (D) $\rightarrow$ (ii)

Natural rubber or raw rubber consists of basic material latex which is a dispersion of isoprene. During the treatment, this isoprene forms a high molecular weight polymer of isoprene. Natural rubber can be obtained from five hundred different species of plants.
Consider the following properties of rubber,
(i) Tensile strength of vulcanized rubber is almost ten times more than raw rubber.
(ii) The elasticity of the raw rubber is very high.
Choose the correct option.

0%
(i) is true (ii) is false.
0%
(i) is false (ii) is true.
0%
Both (i) and (ii) are true.
0%
Both (i) and (ii) are false.

Which of the polymer has weakest intermolecular force of attraction?

0%
nylon
0%
poly(vinyl chloride)
0%
cellulose
0%
natural rubber

Terelyne is a:-

0%
Copolymer
0%
Homopolymer
0%
Natural polymer
0%
Cyclic polymer

Which of the following polymers can be formed by using the following monomer unit?

0%
Nylon-6, 6
0%
Nylon-2-nylon-6
0%
Melamine polymer
0%
Nylon-6

Determine the degree of association (polymerization) for the reaction in aqueous solution

$6HCHO\rightleftharpoons C_6H_{12}O_6$
If observed (mean) molar mass of HCHO and

$C_6H_{12}O_6$ is

$150$ .

0%
$0.50$
0%
$0.833$
0%
$0.90$
0%
$0.96$

Explanation

Let us consider the problem.

$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, 6HCHO \,\,\,\,\,\leftrightarrow {C_6}{H_{12}}{O_6}$

At equation

$c\left( {1 - \alpha } \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\dfrac{{C\alpha }}{6}$

$\dfrac{{Observed\,moles\,concentration}}{{Initial\,moles\,concentration}} = \dfrac{{{M_\gamma }}}{{{M_0}}}$

$\dfrac{{C\left( {1 - \alpha } \right) + \dfrac{{C\alpha }}{6}}}{C} = \dfrac{{{M_\gamma }}}{{{M_0}}} = \dfrac{{30}}{{150}}$

Hence the answer is

$\alpha = 0.96$

Monomer used to prepare orlon is:

0%
$CH_2 = CHCN$
0%
$CH_2 = CH - CI$
0%
$CH_2 = CHF$
0%
$CH_2 = CCI_2$

Explanation

Orlon is the one of the polymer created by DuPont in the year 1941. These are strong and warm used for sweaters and tracksuits.

The monomer of this polymer Orlon is a acrylonitrile [

$CH_2=CHCN$ ].

Sulphur is used in the ________ of rubber.

0%
condensation
0%
vulcanization
0%
addition
0%
substitution

Sulphur is used in the vulcanization of rubber.

0%
True
0%
False

Explanation

$\text { Sulphur }(S)=16=1 s^{2}, 2 s^{2}, 2 p^6, 3 s^{2}, 3 p^{4}$

$\begin{array}{l}\text{Uses- Element sulphur is used in black gunpowder, }\\\text{macthes and fireworks, in volcanization of}\\\text{rubber , as a fingicide, inceticide and fumigant ,}\\\text{the manufacture of phosphate fertilizers }\end{array}$

Give the likely structure of the polymer obtained in each of the following reactions. Also, tell whether these reactions are examples of chain-reaction or step-reaction polymers.

0%
Nylon -6, step-reaction polymer
0%
Nylon-6, chain-reaction polymer
0%
Dacron, step- reaction polymer
0%
Glyptal, chain-reaction polymer

Explanation

The places of polymer formation by repeated condensation reaction between two bi functional on trifunctional monomel unit by elimination of small molecules like

$H_2O,NH_3,CO_2$ is known as condensation polymerization and the polymer formed by this reaction is called condensation Polymer

Examle be- Terylene ,Bakelite, Nylon.6,Cellolose etc

$nNH_2(CH_2)_6NH_2+nCOOH(CH_2)_4COOH\rightarrow -\!\!\![NH(CH_2)_6NHCO(CH_2)_4CO-\!\!\!]\,+nH_2O$

The Polymer Nylon 6 is obtain by healing caprolactam will water at high temperature.

(Refer image)

And the Nylon-6 polymer is fromed by step growth polymermization process where a single monomel is stepwise repeatedly condensed.

Hence, Nylon-6 ans step Reaction Polymer is the correct option for the given Polymer Reaction.

1386504_1085864_ans_a2d1a133ee2e455493ecac11d78e0c89.png

Find the odd one.

0%
Polychloroprene
0%
Polyisoprene
0%
Nitrile rubber
0%
Thiokol rubber

Explanation

Thiokol Rubber is a condensation polymer of

$1,2$ - dichloroethane with sodium polysulphide where as others are addition polymers.

1030390_1033902_ans_9d73fdc2bcf84e8ea3fc72a05c0764bb.png

Identify correct pair of monomers and their polymers?

0%
Glucose - starch, Amlno acids - proteins
0%
Vinyl chloride - PVC, Ester - nylon
0%
Caprolactum - rubber, Fatty acids - fat
0%
Glucose - cellulose, Ethane - polythene

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

0%
Buna - S
0%
Teflon
0%
PVC
0%
Polypropylrnr

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.

The straight chain polymer is formed by :

0%
hydrolysis of $(CH_3)_2SiCl_2$ followed by condensation polymerization
0%
hydrolysis of $(CH_3)_3SiCl$ followed by condensation polymerization
0%
hydrolysis of $CH_3SiCl_3$ followed by condensation polymerization
0%
hydrolysis of $(CH_3)_4Si$ followed by addition polymerization

Explanation

Hint: The condensation polymerization of

$dimethyl \ dihydroxy \ silane$ leads to straight-chain polymerization.

Explanation:

A) On hydrolysis, the

$Cl$ gets replaced by

$OH$ to form

$dihydroxy \ silane$ derivative. This can lead to straight-chain polymerization as shown below.

$(CH_3)_2SiCl_2 \xrightarrow{H_2O} (CH_3)_2Si(OH)_2 \xrightarrow{-H_2O,\ polymerisation} [(CH_3)_2SiO]_n$

B) On hydrolysis of

$(CH_3)_3SiCl$ , it forms

$monohydroxy \ silane$ derivative which leads to branched-chain polymerization.

C) On hydrolysis of

$(CH_3)SiCl_3$ , it forms

$trihydroxy \ silane$ derivative which leads to chain termination.

$(CH_3)_4Si$ is inert to hydrolysis and polymerization due to the lack of

$Cl$ group.

Therefore, the correct answer is option $A$ .

Identify the final product F.

0%
Bakelite
0%
Nylon - 6
0%
Polyester
0%
Natural rubber

Explanation

This is the method of preparation of nylon-6. Phenol is first reduced with hydrogen at high temperature in the presence of a nickel catalyst to obtain cyclohexanol. This on heating with copper undergoes oxidation to form cyclohexanone. Reaction with hydroxylamine in the presence of acidic medium forms an oxime.

This is done in the presence of an acid that rearranges to form caprolactam. The acidic hydrolysis of caprolactam gives a monomer which on polymerization gives nylon-6.

Hence, the correct option is

$\text{B}$

Here, product follows :

0%
free radical substitution mechanism
0%
free radical addition mechanism
0%
elctrophilic addition mechanism
0%
electrophilic substitution mechanism

Structure of some important polymers are given. Which one represents Buna-S?

Nylon-6 is formed from caprolactam which is formed from____________.

0%
cyclohexanone and hydroxyl amino
0%
cyclohexanone and hydrazine
0%
benzophenone and hydrazine
0%
benzophenone and hydroxylamine

Which of the following are polyamide polymers?

0%
Nylon - $6,\: 10$
0%
Nylon - $6,\: 6$
0%
Nylon - $5$
0%
Perlon-U

Explanation

A polyamide is a macromolecule with repeating units linked by amide bonds. Artificially made polyamides can be made through step-growth polymerization or solid-phase synthesis, yielding materials such as nylons, aramids, and sodium polyaspartate.

Nylon -

$6,10$ is prepared from monomers of sebacyl chloride and

$1,6$ -hexanediamine.

Nylon -

$6,6$ is synthesized by polycondensation of hexamethylenediamine and adipic acid.

Nylon -

$5$ is also a polyamide polymer from the same category having peptide linkage.

Perlon-U, also called polyurethane is a polymer of carbamate (urethane) and not amide.

Which of the following is used for coating a non-stick pan?

0%
Nylon
0%
Zefron
0%
Rayon
0%
Teflon

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

0%
Dacron
0%
Nylon - $6,\: 6$
0%
Bakelite
0%
Polyethylene

Which of the following polymers can be made by free radical addition polymerisation mechanism?

0%
PE
0%
HDPE
0%
LDPE
0%
Teflon

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 11 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 11 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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