Tag: polymers of commercial importance

Questions Related to polymers of commercial importance

List - I                                       List - II
A) Polystyrene                        p) Condensation polymer
B) Polythene                           q) Thermoplastic polymer
C) Nylon- $6, :6$                        r) Polyamide
D) Terylene                             s) Addition polymer

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. (a - q,s), (b - q,s), (c - p,q,r), (d - p)

  2. (a - p), (b - s), (c - p,r), (d - p,q)

  3. (a - s), (b - q), (c - p,r), (d - q)

  4. (a - q), (b - s), (c - r), (d - p,q)

Show answer
Correct Option: A
Explanation:
The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene. Addition polymers: Polyvinyl chloride, Polythene, Buna-S, Buna-N, etc.

Polystyrene  is a synthetic aromatic polymer made from the monomer styrene.
It is addition polymer as it is made of addition of monomers.

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, nylon 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylene diamine with adipic acid.


Hence, option A is correct.

List -I                                List -II
A) Polystyrene               p) $C _{6}H _{5}-CH=CH _{2}$
B) Buna-S                      q) $CH _{2}=CH-CH=CH _{2}$
C) Buna - N                    r) $CH _{2}OH-CH _{2}OH$
D) Terylene                    s) Condensation polymer

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. a- p

  2. b- p,q

  3. c-r

  4. d-r,s

Show answer
Correct Option: A,B,D
Explanation:

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

Terylene is a condensation polymer. Monomers of Terylene is ethylene glycol and teri-phthalic acid.
Buna-S is formed by the monomeric addition of compound styrene (p) and butadiene (q). 
Hence, options A, B and D are correct options.

Generally, polyamides are _____.

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. fiberes

  2. thermoplatics

  3. thermosetting

  4. elastomeres

Show answer
Correct Option: A
Explanation:

Polyamides are generally fibers because of the intermolecular forces like hydrogen bonding which gives them high tensile strength.

Non-stick frying pans are coated black with Teflon, a material that is resistant to heat. Teflon is a polymer of:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. fluoromethane

  2. styrene

  3. ethylene

  4. tetrafluoroethylene

Show answer
Correct Option: D
Explanation:
Teflon is a polymer of tetrafluoroethylene $\left({C} _{2}{F} _{4} \right)$, also known as polytetrafluoroethylene. It is a manmade polymer that has particular applications in manufactured products because of the chemical properties of Polytetrafluoroethylene.

Plywood sheets are stuck together by unpolymerized:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. nylon

  2. carbon black

  3. urea-formaldehyde resins

  4. styrene and butadiene

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Correct Option: C

Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. It is unaltered by radiation

  2. It can withstand high temperatures

  3. It is one of the most chemically-resistant plastic in the world

  4. It is an ideal insulator for high-frequency fittings

Show answer
Correct Option: A
Explanation:

$PTFE$ (Poly tetra fluoro ethylene) is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.

Teflon (tetrafluoroethylene) is a black material used in non-stick pans for frying chips and vegetables. The oil or butter does not stick at all. In the process of manufacture, one of the technical problems is:

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. to make teflon stick to the metal of the pan

  2. to make teflon that is non-sticky

  3. to make teflon

  4. to cut a round sheet of teflon that exactly fits

Show answer
Correct Option: A
Explanation:

Teflon even when melted do not flow instead it behaves as a gel due to absence of crystalline phase and high melting point so manufactures finds a bit difficulty to make teflon stick to metal of pan.

Which monomer is used in preparation of orlon?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. $CF _2=CF _2$

  2. $CH _2=CH-CN$

  3. $CH _2=CH-Cl$

  4. $CH _2=CH-OH$

Show answer
Correct Option: B
Explanation:

Vinyl cyanide $ \displaystyle (CH _2=CH-CN)$ is the monomer that is used in preparation of orlon.

$ \displaystyle nCH _2=CH(CN)  \to [-CH _2-CH(CN)-] _n$.

Hence, the correct option is $B$.


Identify $X$ in the reaction.


$CHCl _3 \xrightarrow[HF]{SbF _3} CHF _2Cl \overset{1070\, K}{\rightarrow} (X)+2HCl$

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. $F _2C=CF _2$

  2. $ClFC=CFCl$

  3. $F _2C=CFCl$

  4. $F _2C=CCl _2$

Show answer
Correct Option: A
Explanation:

When chloroform is treated with antimony trifluoride and $HF$, 2 chlorine atoms are replaced with 2$ F$ atoms. 


When $\displaystyle CHF _2Cl $ is heated to 1070 K, terafluoroethylene (compound X) is obtained. 

$\displaystyle 2CHF _2Cl \xrightarrow {1070K} F _2C=CF _2 $

Which of the following fibres is a polyesters?

chemistry materials polymers of commercial importance some commercially important polymers condensation polymers

  1. Terylene

  2. Nylon-66

  3. Nylon-6

  4. Rayon

Show answer
Correct Option: A
Explanation:

Terylene fibres are made up of polyesters as they have repeating $-O-\underset { \parallel \ O }{ C } -$-group.