Polymers Test

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Polymers Test - 60

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Weekly Quiz Competition

Question 1
1 / -0

The monomers of Buna-S rubber are:

A
vinyl chloride and sulphur

B
butadiene

C
styrene and butadiene

D
isoprene and butadiene

Solution

Styrene and 1,3 butadiene polymerizes in the presence of $$Na$$ metal and forms Buna-S rubber.

So, the monomer units in Buna-S rubber are Styrene and 1,3 butadiene.

Hence, option C is correct.
Question 2
1 / -0

Soft drink and baby feeding bottles are generally made up of:

A
Polyester

B
Polyurethane

C
Polyurea

D
Polystyrene

Solution

Soft drink and baby feeding bottles are generally made up of. Polystyrene.Polystyrene is the polymer of phenylethylene (styrene).
Question 3
1 / -0

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

A
$$\beta -$$ hydroxy valeric acid, amino caproic acid

B
$$\beta -$$ hydroxy butyric acid, $$\beta -$$ hydroxy valeric acid

C
$$\beta -$$ hydroxy butyric acid, adipic acid

D
Lactic acid, adipic acid

Solution

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.
Question 4
1 / -0

In the reaction sequence, $$X$$ is:

A
cyclohexanone

B
caprolactam

C
$$HO(CH_2)_6NH_2$$

D
hexamethyline disocyanate

Solution

Caprolactam is the monomer of nylon-$$6$$. Nylon$$- 6$$ is made by heating caprolactam to about $$250^0\ C$$ with about $$5-10\%$$ water thrown in.

Hence, the compound X is caprolactam.
Question 5
1 / -0

Under high pressure and in presence of nickel cyanide catalyst, acetylene on polymerisation gives:

A
Benzene

B
Mesitylene

C
Cyclo-octatetraene

D
Vinyl acetylene

Solution

In the presence of nickel cyanide as a catalyst and under high pressure, four molecules of ethyne combine to form a tetramer called cycloocta-1,3,5,7-tetraene.

Hence, option C is correct.
Question 6
1 / -0

Teflon is an example of polymer which is a/an:

A
polyamide

B
addition polymer

C
polyester

D
formaldehyde resin

Solution

Teflon is prepared by the combination of a large number of tetrafluoroethylene molecules, without the elimination of any small molecule. Therefore, it is an example of addition homopolymer.
$$nCF_{2} = CF_{2} \rightarrow -[CF_{2} - CF_{2}]-_{n}$$.
Question 7
1 / -0

The repeating unit present in nylon $$-6$$ is:

A
$$-[NH(CH_{2})_{6}NHCO(CH_{2})_{4}CO]-$$

B
$$-[CO(CH_{2})_{5}NH]-$$

C
$$-[CO(CH_{2})_{6}NH]-$$

D
$$-[CO(CH_{2})_{4}NH]-$$

E
$$-[NH(CH_{2})_{4}NHCO(CH_{2})_{6}CO]-$$

Solution

The monomer in $$nylon - 6$$ is caprolactum.

Amnio caproic acid is produced from the hydrolysis of caprolactum.

$$\underset {\text {Amnio caproic acid}}{H_2N-(CH_2)_5-COOH} \xrightarrow{\Delta, \, polymerisation} \underset{Nylon-6}{-\!\![NH - (CH_2)_5-\overset{O}{\overset{||}{C}}-\!\!\!]_n}$$

$$Nylon - 6$$ is used in making fibres plastics, tyre cords and ropes.
Hence, option B is correct.
Question 8
1 / -0

Tubeless tyres are co-polymers of isoprene and :

A
neoprene

B
silicons

C
isobutylene

D
PAN

Solution

Tubeless tyres are copolymers of isoprene and isobutylene.

Isobutylene is $$ \displaystyle CH_2=C(CH_3)_2$$. It is also called 2-methylprop-1-ene.

Isoprene is $$ \displaystyle CH_2=C(CH_3)-CH=CH_2$$. It is also called 2-methyl-1,3-butadiene.

Hence, option C is correct.
Question 9
1 / -0

The monomers of Buna-S rubber are:

A
isoprene and butadiene

B
butadiene and phenol

C
styrene and butadiene

D
vinyl chloride and sulphur

Solution

The monomers of Buna-S rubber are styrene and butadiene.
Styrene is ethyl benzene $$ \displaystyle C_6H_5-CH=CH_2 $$.

Butadiene is $$ \displaystyle CH_2=CH-CH=CH_2$$

Buna S is also called styrene butadiene rubber. It is used in making inner tubes for tyres, motors, bubble gums, etc.

Hence, option C is correct.
Question 10
1 / -0

Which one of the following statement is not true?

A
Natural rubber has trans configuration at every double bond

B
BUNA-S is copolymer of butadiene and styrene

C
Natural rubber is 1,4 polymer of isoprene

D
In vulcanization, the formation of sulphur bridges between different chains makes rubber harder and stronger

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Polymers Test - 60

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Question 1

vinyl chloride and sulphur

butadiene

styrene and butadiene

isoprene and butadiene

Solution

Question 2

Polyester

Polyurethane

Polyurea

Polystyrene

Solution

Question 3

$$\beta -$$ hydroxy valeric acid, amino caproic acid

$$\beta -$$ hydroxy butyric acid, $$\beta -$$ hydroxy valeric acid

$$\beta -$$ hydroxy butyric acid, adipic acid

Lactic acid, adipic acid

Solution

Question 4

cyclohexanone

caprolactam

$$HO(CH_2)_6NH_2$$

hexamethyline disocyanate

Solution

Question 5

Benzene

Mesitylene

Cyclo-octatetraene

Vinyl acetylene

Solution

Question 6

polyamide

addition polymer

polyester

formaldehyde resin

Solution

Question 7

$$-[NH(CH_{2})_{6}NHCO(CH_{2})_{4}CO]-$$

$$-[CO(CH_{2})_{5}NH]-$$

$$-[CO(CH_{2})_{6}NH]-$$

$$-[CO(CH_{2})_{4}NH]-$$

$$-[NH(CH_{2})_{4}NHCO(CH_{2})_{6}CO]-$$

Solution

Question 8

neoprene

silicons

isobutylene

PAN

Solution

Question 9

isoprene and butadiene

butadiene and phenol

styrene and butadiene

vinyl chloride and sulphur

Solution

Question 10

Natural rubber has trans configuration at every double bond

BUNA-S is copolymer of butadiene and styrene

Natural rubber is 1,4 polymer of isoprene

In vulcanization, the formation of sulphur bridges between different chains makes rubber harder and stronger

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