Polymers Test

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Polymers Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

The outer capsule of drugs is made up of a polymer of:

A
glycolic acid and lactic acid

B
glycine and caproic acid

C
salicylic acid and p-aminobenzoic acid

D
$$3$$-hydroxybutanoic acid and $$3$$-hydroxypentanoic acid

Solution

The outer capsule of drugs is made up of PHBV (poly $$\beta$$-hydroxy butyrate-co-$$\beta$$-hydroxy valerate) which is used in specially packaging orthopedic devices and in controlled release of drugs.
Question 2
1 / -0

Low density polythene is prepared by:

A
Free radical polymerizaiton

B
Cationic polymerization

C
Anionic polymerization

D
Ziegler - Natta polymerization

Solution

The polymerization of ethene to polythene consists of heating or exposing to light, a mixture of ethene with a small amount of benzoyl peroxide initiator.
Question 3
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Soft drinks bottles and baby feeding bottles are generally made up of:

A
polyester

B
polyurethane

C
polystyrene

D
polyamide

Solution

Polystyrene is a synthetic aromatic polymer made from monomer styrene. It is a thermoplastic polymer. It is used as soft drinks and baby feeding bottles because it can be easily moulded and fine details can be printed on it.
Question 4
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Nylon threads are made of ________.

A
polyethylene polyemer

B
polyvinyl polymer

C
polyester polymer

D
polyamide polymer

Solution

Nylon threads are polymer of polyamides obtained by condensing amides and /or carboxylic acids
Examples are nylon - $$6$$, nylon - $$6,\: 6$$.
Question 5
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Natural rubber and gutta-percha respectively, are ___.

A
cis-polyisoprene and trans-polyisoprene

B
both are cis-polyisoprene

C
both are trans-polyisoprene

D
trans-polychloroprene and cis-polychloroprene

Solution

Natural rubber and gutta-percha respectively, are cis-polyisoprene and trans-polyisoprene.
Isoprene is 2-methyl-1,3-butadiene.
Natural rubber has long flexible chains, weak intermolecular forces and exhibits elastic properties.
Gutta-percha has zigzag chains fitting in one another. It is non elastic and crystalline.
Question 6
1 / -0

Formation of polyethylene from calcium carbide takes place as given below:
$$CaC_{2}+2H_{2}O\rightarrow Ca\left ( OH \right )_{2}+C_{2}H_{2}$$
$$C_{2}H_{2}+H_{2}\rightarrow C_{2}H_{4}$$
$$nC_{2}H_{4}\rightarrow \left ( -CH_{2}-CH_{2}- \right )_n$$
The amount (in kg) of polyethylene obtained from $$64.1$$ kg of $$CaC_{2}$$ is

A
$$7$$

B
$$14$$

C
$$21$$

D
$$28$$

Solution

Number of moles of $$CaC_2=\dfrac{64.1\times10^3}{64}=1000$$ mol

One mole of $$CaC_2$$ on hydrolysis and hydrogenation forms one mole of ethene.

$$ \therefore $$ Number of moles of ethene formed $$=1000$$ mol

$$\therefore$$ Mass of polyethene $$=(1000\times{28})$$ g $$=28$$ kg
Question 7
1 / -0

Which of the following is an alternative copolymer?

A
Styrene

B
Neoprene

C
Nylon - $$2$$ - nylon - $$6$$

D
Nylon - $$6$$

Solution

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:
$$HOOC-(CH_2)_4-COOH + H_2N-(CH_2)_2-NH_2 \rightarrow -[NH(CH_2)_2NHCO(CH_2)_4CO]_n- + nH_2O$$
Question 8
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Which of the following is chloroprene ?

A
$$CH_{2}= CH-CH= CH_{2}$$

B

C

D

Solution

Chloroprene is 2-chloro-1,3-butadiene. It is represented by the following structure.

Option B is correct.
Question 9
1 / -0

The IUPAC name of the compound formed when natural rubber is subjected to ozonolysis is _____.

A
$$3$$-oxopentanal

B
$$5$$-formyl-$$2$$-pentanone

C
$$4$$-oxopentanal

D
$$4$$-formyl-$$2$$-pentanone

Solution

Natural rubber is a linear polymer of isoprene ($$2$$-methyl-$$1,3$$-butadiene). On ozonolysis, natural rubber gives $$4$$-oxo-pentanal as shown in the reaction given above.
Question 10
1 / -0

Which of the following is isoprene?

A
$$CH_{2}= CH-CH= CH_{2}$$

B
$$CH_{2}= C(CH_3)-CH= CH_{2}$$

C
$$CH_{2}= C(Cl)-CH= CH_{2}$$

D
$$CH_{2}= C(CH_3)-C(CH_3)= CH_{2}$$

Solution

Isoprene is a hemiterpene with the formula $$CH_2=C(CH_3)CH=CH_2$$; the monomer of natural rubber and a common structure motif to the isoprenoids, a large class of other naturally occurring compounds.

It has a role as a plant metabolite. It is an alkadiene, a hemiterpene and a volatile organic compound.

Hence, the correct option is $$\text{B}$$