Polymers Test

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Polymers Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

In the above shown sequence, the final product $$F$$ is :

A
bakelite

B
nylon - $$6$$

C
polyester

D
natural rubber

Solution

$$Caprolactum$$ is prepared from $$phenol$$ via $$cyclohexanone$$ upon hydrogenation, oximation and Beckmann rearrangement.

This, on polymerization, gives Nylon - $$6$$.

Option B is correct.
Question 2
1 / -0

Identify the final product F.

A
Bakelite

B
Nylon - 6

C
Polyester

D
Natural rubber

Solution

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 $$\text{B}$$
Question 3
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$$CH_3-CH_3\xrightarrow{Pyrolysis}A$$

$$A\xrightarrow [C_6H_5-CO-O-O-CO-C_6H_5]{1000-2000 atm, traces\ of \ O_2, \Delta} B$$

$$A\xrightarrow [6-7 atm, \Delta]{Ziegler-Natta\ Catalyst}C$$

Here, B and C are:

A
LDPE, HDPE

B
HDPE, LDPE

C
LDPE, LDPE

D
HDPE, HDPE

Solution

Product B and C are polyethene.
The low density polythene (LDP) is obtained by the polymerisation of ethene under high pressure of $$1000 $$ to $$2000$$ atm at a temperature of $$350$$ K to $$570$$ K in the presence of traces of dioxygen or a peroxide initiator (catalyst).
The low density polythene (LDP) is obtained through the free radical addition and H-atom abstraction has highly branched structure.
The high density polyethene is formed when addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of $$333$$ K to $$343$$ K and under a pressure of $$6-7$$ atm. High density polythene (HDP) thus, produced consists of linear molecules and has a high density due to close packing.
Question 4
1 / -0

Which of the following is the IUPAC name of the aromatic monomer is present in melmac?

A
$$2,\: 4,\: 6$$ -Triamino - $$1,\: 3,\: 5$$ - triazine

B
Methanal

C
$$1,\: 3,\: 5$$ - Triamine - $$2,\: 4,\: 6$$ - triazine

D
Melamine

Solution

The IUPAC name of the aromatic monomer present in Melmac (or melamine-formaldehyde resin) is 2,4,6 - triamino - 1,3,5 - triazine. Its common name is melamine.

So, the correct option is 'A'.
Question 5
1 / -0

Here, product follows :

A
free radical substitution mechanism

B
free radical addition mechanism

C
elctrophilic addition mechanism

D
electrophilic substitution mechanism
Question 6
1 / -0

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

A
cyclohexanone and hydroxyl amino

B
cyclohexanone and hydrazine

C
benzophenone and hydrazine

D
benzophenone and hydroxylamine

Solution

When cyclohexanone is reacted with hydroxyl amino in presence of acidic medium then caprolactam is formed, which is used for nylon-6 production.
Question 7
1 / -0

Gutta Percha is_________.

A
trans-polyisoprene

B
non-elastic and softens to a plastic-like material on heating

C
used in underwater cables and golf balls

D
All of the above

Solution

Gutta-percha is natural latex obtained from Palaquium gutta and several other evergreen trees of East Asia. The latex collected by felling or girdling the tree is allowed to coagulate and is then washed, purified and moulded into bricks for shipping. Gutta-percha is a polyterpene, i.e., a polymer of isoprene. It is not very elastic and has a trans structure. Gutta-percha is an excellent nonconductor and is often employed in insulating marine and underground cables. It is also used for golf-ball coverings, surgical appliances and adhesives.
Option D is correct.
Question 8
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SBR (GRS, Buna-S, Cold Rubber) is obtained by free radical copolymerisation of :

A
$$70\%$$ Buta - $$1, \:3$$ - diene and $$30\%$$ phenly ethene (styrene)

B
chloroprene and styrene

C
vinly-acetylene and styrene

D
isoprene and $$1,\: 3$$ - butadiene

Solution

Styrene rubber or SBR (Styrene butadiene rubber) or GRS (Government controlled styrene rubber) is prepared by the copolymerization of buta - $$1,\:3$$ - diene ($$70\%$$) and styrene ($$30\%$$). The name Buna-S is made up of Bu which indicates Buta - $$1,\:3$$ - diene, NA is for Sodium ($$Na$$) and S indicates Styrene.

Option A is correct.
Question 9
1 / -0

Nylon$$-5,\:10$$ can be prepared by:

A
$$H_2N(CH_2)_5NH_2+$$ $$\text{Decanoic acid (Sebacic acid)}$$

B
$$HOOC(CH_2)_3COOH+H_2N(CH_2)_{10}NH_2$$

C
$$H_2N(CH_2)_6NH_2+HOOC(CH_2)_8COOH$$

D
$$H_2N(CH_2)_{10}NH_2+HOOC(CH_2)_4COOH$$

Solution

Nylon - $$5,\:10$$ is made from pentamethylene diamine and sebacic acid as per the reaction shown.
Question 10
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Isoprene is the repeating unit in :

A
vitamin A

B
terpenes

C
natural rubber

D
All of the above

Solution

Nearly all terpenes found in the essential oils of many plants have carbon skeleton made up of isoprene units joined in a regular, head-to-tail way. Natural rubber is also formed by the monomer isoprene. Isoprene chains are also commonly found in biologically active oligomers such as Vitamin A.