Polymers

NEET Chemistry · 72 questions · Page 3 of 8 · Click an option or "Show Solution" to reveal answer

Q21

Which compound forms linear polymer due to H-bond?

A H 2 O

B NH 3

C HF

D HCl

Correct Answer

Option C

Solution

HF form linear polymer due to H-bonding.

H - F ....

H - F Due to high electronegativity value of 'F' atom it forms effective hydrogen bonds.

Q22

Which of the following is a polyamide?

A Teflon

B Nylon – 6, 6

C Terylene

D Bakelite

Correct Answer

Option B

Solution

Nylon is a general name for all synthetic fibres forming polyamides.

Q23

Which of the following is fully fluorinated polymer?

A Neoprene

B Teflon

C Thiokol

D PVC

Correct Answer

Option B

Solution

Teflon is polymer of

C{F_2} = C{F_2}.

Q24

The formation of which of the following polymers involves hydrolysis reaction?

A Bakelite

B Nylon 6, 6

C Terylene

D Nylon 6

Correct Answer

Option D

Solution

Formation of nylon-6 involves hydrolysis of caprolactum, (its monomer) in initial state.

Q25

In polymer Buna-S : 'S' stands for :

A Sulphur

B Styrene

C Strength

D Sulphonation

Correct Answer

Option B

Solution

Buna-S is the co-polymer of but 1, 3-diene and styrene as follows.

Styrene butadiene rubber is also called buna-S, in which ‘Bu’ stands for butadiene, ‘na’ stands for sodium and ‘S’ stands for styrene.

Since, butadiene and styrene is one of the constituent monomer of given polymer.

Q26

Which of the following is an example of polyester?

A Butadiene-styrene copolymer

B Melamine polymer

C Neoprene

D Poly-

\beta

-hydroxybutyrate-co-

\beta

-hydroxyvalerate

Correct Answer

Option D

Solution

Polyesters are formed by condensation reaction between alcohols and carboxylic acid.

Poly- $\beta$ -hydroxybutyrate-co- $\beta$ -hydroxy valerate (PHBV) is a polymer obtained by condensation reaction of 3-hydroxybutanoic acid with 3-hydroxypentanoic acid.

Hence, PHBV is a polyester.

Q27

Match List I with List II .tg .tg List I List II A. Elastomeric polymer I. Urea formaldehyde resin B. Fibre Polymer II. Polystyrene C. Thermosetting Polymer III. Polyester D. Thermoplastic Polymer IV. Neoprene Choose the correct answer from the options given below :

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

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

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

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

Correct Answer

Option C

Solution

.tg .tg A.

Elastomeric fibre (IV) Neoprene B.

Fibre polymer (III) Polyester C.

Thermosetting polymer (I) Urea Formaldehyde Resin D.

Thermoplastic polymer (II) Polystyrene

Q28

Caprolactam when heated at high temperature in presence of water, gives

A Dacron

B Nylon 6

C Teflon

D Nylon 6,6

Correct Answer

Option B

Solution

Caprolactum

\overset{\Delta}\longrightarrow

Nylon $-$ 6

Q29

Which of the following is NOT a natural polymer?

A Protein

B Starch

C Rubber

D Rayon

Correct Answer

Option D

Solution

Starch, Protein, Rubber are natural polymer.

Rayon is a semi-synthetic fiber, made from natural sources of regenerated cellulose, such as wood and related agricultural products.

Q30

Given below are two statements : Statement I : Ethene at 333 to

343 \mathrm{~K}

and

6

7

atm pressure in the presence of

\mathrm{AlEt}_{3}

and

\mathrm{TiCl}_{4}

undergoes addition polymerization to give LDP. Statement II : Caprolactam at

533

543 \mathrm{~K}

\mathrm{H}_{2} \mathrm{O}

through step growth polymerizes to give Nylon 6. In the light of the above statements, choose the correct answer from the options given below:

A Both Statement I and Statement II are true

B Statement I is true but Statement II is false

C Statement I is false but Statement II is true

D Both Statement I and Statement II are false

Correct Answer

Option C

Solution

Statement I is false.

Ethene (ethylene) under certain conditions (high pressure, high temperature) in the presence of catalysts does undergo addition polymerization, but it forms polyethylene, not LDP (Low-Density Polyethylene) specifically.

The formation of low-density polyethylene (LDPE) vs high-density polyethylene (HDPE) depends on the specific conditions and catalysts used.

The catalysts mentioned (AlEt3 and TiCl4) are associated with the production of HDPE through the Ziegler-Natta process, not LDPE.

Statement II is true.

Caprolactam polymerizes to form Nylon 6 via a ring-opening polymerization mechanism, which is a type of step-growth polymerization.

The process is often carried out at high temperatures, and water is a byproduct of the reaction, so the description in Statement II is accurate.

Therefore, Option C (Statement I is false but Statement II is true) is the correct answer.

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