Polymers Test

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Polymers Test - 10

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Weekly Quiz Competition

Question 1
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Structure of some important polymers are given. Which one represents Buna-S?

A

B

C

D

Solution

Buna-S is a polymer of Butadiene and Styrene.
The structure of Buna-S is shown in the figure.
Option B is correct.
Question 2
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Preparation of Bakelite proceeds via reactions :

A
Electrophilic substitution and dehydration

B
Electrophilic addition and dehydration

C
Nucleophilic addition and dehydration

D
Condensation and elimination

Solution

Formation of Bakelite follows electrophilic substitution Reaction of Phenol with formaldehyde followed by condensation.

Hence, option A is correct.
Question 3
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Which of the following polymers is synthesized using a free radical polymerization technique?

A
Terylene

B
Melamine polymer

C
Nylon 6,6

D
Teflon

Solution

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 $$D$$
Question 4
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Which of the following statements about low density polythene is FALSE ?

A
It is a poor conductor of electricity

B
Its synthesis requires dioxygen or a peroxide initiator as a catalyst

C
It is used in the manufacture of buckets, dust-bins etc.

D
Its synthesis requires high pressure

Solution

Low density polythene is a poor conductor of electricity. For the preparation of this low density polythene dioxygen or a peroxide initiator is used as a catalyst and its synthesis requires high pressure but it is not used in preparation of buckets, dust-bins etc. The preparation of Low density polythene is exothermic process.
So, answer is C.
Question 5
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Which one is classified as a condensation polymer?

A
Teflon

B
Acrylonitrile

C
Dacron

D
Neoprene

Solution

Condensation polymers are any kind of polymers formed through a condensation reaction where molecules join together losing small molecules
as by-products such as water or methanol etc.

Teflon, acrylonitrile and neoprene are addition polymers while dacron is a condensation polymer.

Option C is correct.
Question 6
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Which polymer has 'chiral' monomer(s)?

A
$$PHBV$$

B
Nylon $$6,6$$

C
Buna$$-N$$

D
Neoprene

Solution

PHBV polymer is made up from monomers 3-hydroxy butanoic acid & 3 hydroxy pentanoic acid as, [Ref. image 1]

If we look at the monomers of PHBV, the starred carbon has 4 different groups attached to carbon that means they are chiral one.

Nylon 6,6 is made up from hexamethylene diamine & adipic acid as. [Ref. image 2]
So, here no monomer is chiral.

Buna-N formed from 1,3 butadiene and acrylonitrile as, [Ref image 3]
Here also no monomer is chiral

Neoprene is made up from monomer chloroprene as, [Ref. image 4]
Here as well there is no chiral center present in this compound.
So, In PHBV only there chiral monomer are there.

Hence option A is correct.
Question 7
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Which of the following is a biodegradable polymer?

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

B
$$-\!\!\![\,HN-(CH_2)_5-\overset{O}{\overset{||}C}]\!\!\!-_n$$

C

D
$$-\!\!\![\,HN-(CH_2)_5CONH-CH_2-\overset{O}{\overset{||}C}\,]\!\!\!-_n$$

Solution

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.
Question 8
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Buna-N synthetic rubber is a copolymer of:

A
$$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-\mathrm{CH}=CH_2$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$

B
$$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$ and $$\mathrm{H}_{5}\mathrm{C}_{6}-CH=\mathrm{C}\mathrm{H}_{2}$$

C
$$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CN$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CH=\mathrm{C}\mathrm{H}_{2}$$

D
$$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-CN$$ and $$\mathrm{H}_{2}\mathrm{C}=\mathrm{C}\mathrm{H}-\mathrm{C(CH_3)}=CH_2$$

Solution

Buna - N is a copolymer of acrylonitrile ($$H_2C $$= $$CH $$– $$CN$$ ) and buta-$$1,\:3$$-diene($$H_2C $$= $$CH$$ – $$CH$$=$$CH_2$$).

Hence, the correct option is C.
Question 9
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Which one of the following structures represents the neoprene polymer?

A

B

C

D

Solution

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.
Question 10
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Nylon is an example of:

A
polyester

B
polysaccharide

C
polyamide

D
polythene

Solution

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