Polymers — Page 7 | NEET Chemistry

Q61

Orlon fibres are made up of :

A Polyacrylonitrile

B Polyesters

C Polyamide

D Cellulose

Correct Answer

Option A

Solution

Orlon fibers are made up of Polyacrylonitrile.

Q62

Match with .tg .tg Polymer Type/Class

List - I		List - II
(A)	Nylon-2-Nylon-6	(I)	Thermosetting polymer
(B)	Buna-N	(II)	Biodegradable polymer
(C)	Urea-formaldehyde resin	(III)	Synthetic rubber
(D)	Dacron	(IV)	Polyester

A (A)-(IV), (B)-(I), (C)-(III), (D)-(II)

B (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

C (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

D (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Correct Answer

Option C

Solution

Nylon-2-Nylon-6 is a biodegradable polymer.

It is made from two monomers, hexamethylenediamine and adipic acid.

The polymer is strong and durable, but it can also be broken down by bacteria and other microorganisms.

This makes it a good choice for use in products that are designed to be biodegradable, such as food packaging and medical implants.

Buna N is a synthetic rubber.

It is made from a mixture of 1,3-butadiene and acrylonitrile.

The polymer is strong and flexible, and it is resistant to wear and tear.

Buna N is used in a variety of applications, including tires, hoses, and belts.

Urea-formaldehyde is a thermosetting resin.

It is made from a mixture of urea and formaldehyde.

The polymer is hard and strong, and it is resistant to heat, water, and chemicals.

Urea-formaldehyde is used in a variety of applications, including adhesives, coatings, and foams.

Dacron is a polyester.

It is made from a mixture of terephthalic acid and ethylene glycol.

The polymer is strong, durable, and lightweight.

Dacron is used in a variety of applications, including clothing, fabrics, and bottles.

Q63

The two monomers for the synthesis of Nylon 6, 6 are

A HOOC(CH2)6COOH, H2N(CH2)4NH2

B HOOC(CH2)4COOH, H2N(CH2)6NH2

C HOOC(CH2)4COOH, H2N(CH2)4NH2

D HOOC(CH2)6COOH, H2N(CH2)6NH2

Correct Answer

Option B

Solution

Nylon $-$ 6, 6 is an amide polymer.

Amide polymer is created using the monomer of amine and acid.

Nylon $-$ 6, 6 is created using 6 carbon amine and 6 carbon acid.

So, the amine is, H2N $-$ (CH2)6 $-$ NH2 and the acid is, HOOC(CH2)4COOH

Q64

The polymer

\mathrm{X}

- consists of linear molecules and is closely packed. It is prepared in the presence of triethylaluminium and titanium tetrachloride under low pressure. The polymer

\mathrm{X}

is-

A High density polythene

B Polytetrafluoroethane

C Low density polythene

D Polyacrylonitrile

Correct Answer

Option A

Solution

The polymer X described in the question is synthesized using triethylaluminium and titanium tetrachloride under low pressure.

This is a clear indication that the Ziegler-Natta catalyst is used, which is typically employed in the synthesis of high-density polyethylene (HDPE).

High-density polyethylene is made up of linear molecules that pack closely together, giving the material its high density.

This is in contrast to low-density polyethylene (LDPE), which has a branched structure that prevents the chains from packing closely together.

So, the polymer X is : Option A: High-density polyethylene.

Q65

Which is true about Buna-N?

A It is a linear polymer of 1, 3-butadiene.

B It is obtained by copolymerization of 1, 3-butadiene and styrene.

C It is obtained by copolymerization of 1, 3-butadiene and acrylonitrile.

D The suffix N in Buna-N stands for its natural occurrence.

Correct Answer

Option C

Solution

It is copolymerization of 1, 3-butadiene and acrylonitrile.

Q66

The correct match between Item-I and Item-II is : .tg .tg Item - I Item - II

List - I		List - II
(a)	High density polythene	(I)	Peroxide catalyst
(b)	Polyacrylonitrile	(II)	Condensation at high temperature & pressure
(c)	Novolac	(III)	Ziegler-Natta Catalyst
(d)	Nylon 6	(IV)	Acid or base catalyst

A (a)

\to

(IV), (b)

\to

(II), (c)

\to

(I), (d)

\to

(III)

B (a)

\to

(III), (b)

\to

(I), (c)

\to

(IV), (d)

\to

(II)

C (a)

\to

(II), (b)

\to

(IV), (c)

\to

(I), (d)

\to

(III)

D (a)

\to

(III), (b)

\to

(I), (c)

\to

(II), (d)

\to

(IV)

Correct Answer

Option B

Solution

High density polythene is obtained by using Ziegler-Natta Catalyst.

Polyacrylonitrile is obtained by acrylonitrile using peroxide catalyst.

Novalac is obtained by acid or base catalyzed polymerization of phenol.

Nylon–6 is condensation polymer which is made at higher temperature and pressure.

Q67

Which of the following sets are correct regarding polymer? (A) Copolymer : Buna-S (B) Condensation polymer : Nylon-6,6 (C) Fibres : Nylon-6,6 (D) Thermosetting polymer : Terylene (E) Homopolymer : Buna-N Choose the correct answer from given options below :

A (A), (B) and (C) are correct

B (B), (C) and (D) are correct

C (A), (C) and (E) are correct

D (A), (B) and (D) are correct

Correct Answer

Option A

Solution

(A) Buna-S $\quad-\quad$ Copolymer (B) Nylon-6,6 $\quad-\quad$ Condensation polymer (C) Nylon-6,6 - Fibre (D) Terylene $\quad-\quad$ Thermoplastic (E) Buna-N $\quad-\quad$ Copolymer $\therefore$ A, B and C are correct.

Q68

Match List I with List II .tg .tg LIST I LIST II A. Weak intermolecular forces of attraction I. Hexamethylenediamine + adipic acid B. Hydrogen bonding II.

\mathrm{AlEt_3+TiCl_4}

C. Heavily branched polymer III. 2 - chloro - 1, 3 - butadiene D. High density polymer IV. Phenol + formaldehyde Choose the correct answer from the options given below:

A A-III, B-I, C-IV, D-II

B A-IV, B-I, C-III, D-II

C A-II, B-IV, C-I, D-III

D A-IV, B-II, C-III, D-I

Correct Answer

Option A

Solution

(A) Weak Intermolecular Forces are present in polymer of 2-chloro, 1, 3-butadiene (B) Hydrogen Bonding is present in NYLON-66 which is a polymer of Hexamethylenediamine and adipic acid (C) Heavily branched polymer is Bakelite which is polymer of phenol and formaldehyde (D) High density polymer prepration requires $\mathrm{AL}(\mathrm{Et})_3$ and $\mathrm{TiCl}_4$ as a catalyst (Ziegler Natta Catalyst)

Q69

Which of the following polymers is synthesized using a free radical polymerization technique ?

A Teflon

B Terylene

C Melamine polymer

D Nylon 6, 6

Correct Answer

Option A

Solution

Terylene, Melamine and Nylon-6, 6 are condensation polymers.

Teflon is an addition polymer which is formed by free radical polymerization of its monomer, (CF2 = CF2).

Q70

Which one is classified as a condensation polymer?

A Teflon

B Acrylonitrile

C Dacron

D Neoprene

Correct Answer

Option C

Solution

Except Dacron all are additive polymers. Terephthalic acid condenses with ethylene glycol to give Dacron.