Tag: introduction to polymers and its classification

Questions Related to introduction to polymers and its classification

Arrange the following polymers in the order of their intermolecular forces?


Nylon-6,6 $(P)$, Buna-S $(Q)$, and Polythene $(R)$ 

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $Q>R>P$

  2. $P>R>Q$

  3. $Q>P>R$

  4. $P>Q>R$

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Correct Option: B

Zeifler-Natta catalystic system is a combination of :

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $Rh(Ph _{3}P) _{3}CI$ and $H _{2}$

  2. $Ti(O^{i}Pr) _{4}$ and $^{t}BuOOH$

  3. $Rh(Ph _{3}P) _{3}CI$ and $CO$

  4. $TiCI _{4}$ and $AI(C _{2}H _{2}) _{3}$

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Correct Option: D

Monomers of Natural Rubber and Neoprene are Respectively : 

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $CH _3 - \underset{CH _3}{\underset{|}{C}} = CH - CH _3 , \, \, CH _3 - \underset{Cl}{\underset{|}{C}} = CH - CH _3$

  2. $CH _2 = \underset{CH _3}{\underset{|}{C}} - CH = CH _2$ $CH _2 = \underset{Cl}{\underset{|}{C}} - CH = CH _2$

  3. $CH _2 = CH - CH = CH _2$ , $CH _2 = CH - Cl$

  4. $CH _2 = \underset{Cl}{\underset{|}{C}} - CH = CH _2$ $CH _2 = \underset{CH _3}{\underset{|}{C}} - CH = CH _2$

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Correct Option: B
Explanation:

CH2=C|CH3−CH=CH2monomerofneutralrubberCH2=C|CH3−CH=CH2monomerofneutralrubber             CH2=C|Cl−CH=CH2monomerofneoprene

Which of the following substance is not a covalent polymer?

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Silica

  2. Diamond

  3. Glucose

  4. Silicon carbide

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Correct Option: C
Explanation:

Silica  - giant polymer with basic unit $SiO _2$.
Diamond - a polymer with a basic unit carbon atom.
Glucose - $C _6 H _{12} O _6$ is not a polymer.
Silicon carbide (SiC) - a polymer with basic SiC.

Polymerisation may occur through intermediate formation of___________.

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. carbocations

  2. carbanions

  3. free radicals

  4. carbenes

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Correct Option: A,B,C
Explanation:

Polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks. There are many forms of polymerization like free radical electrophilic and nucleophile polymerisations through the formation of free radicals, carbanions and carbocation intermediates. Carbene doesn't form in the reaction mechanism as intermediate.
Hence, options A, B and C are correct.

State True or False.

The presence of double bonds in rubber molecules influence their structure and reactivity.

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. True

  2. False

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Correct Option: A
Explanation:

The given statement is true.
The presence of double bonds in rubber molecules influence their structure and reactivity.
In natural rubber, double bonds have cis configuration. Hence, the chains do not come closer this results in weak intermolecular attractions. Natural rubber has coiled structure, it is elastic and non-crystalline. 
In gutta-percha(synthetic rubber) double bonds have trans configuration. The zig-zag chains pack more closely. It is highly crystalline, non elastic, hard & brittle.

The basis on the mode of their formation, the polymers can be classified:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. As addition polymers only

  2. As condensation polymers only

  3. As copolymers

  4. Both as addition and condensation polymers

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Correct Option: D
Explanation:

On the basis of the mode of their formation, the polymers can be classified as addition polymers and condensation polymers.
Addition polymers are formed by chain growth polymerization and condensation polymers are formed by the combination of two monomers by the elimination of a small molecule like water or methyl alcohol.


Option D is correct.

Woolen clothes are mostly used in:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. summer days

  2. rainy days

  3. cold days

  4. cloudy days

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Correct Option: C
Explanation:

Woolen clothes are mostly used in Cold days. They trap our body heat and provide us warmth in the winters.

Removal of fleece of sheep with skin is

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Shaving

  2. Refining

  3. Shearing

  4. None of the above

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Correct Option: C
Explanation:

The fleece of the sheep along with a thin layer of skin is removed from its body. This process is called shearing. 

Polyethene is produced by :

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. isomerization

  2. polymerisation

  3. hydrogenation

  4. all of the above

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Correct Option: B
Explanation:

Polymerization is the process of reacting monomer molecules together in a chemical reaction to form polymer chains or three dimensional networks.There are many forms of polymerization like step growth and chain growth.It occurs via variety of reaction mechanisms due to functional groups present and their steric effects.