Tag: polymer

Quizzes (7) Questions (194)

Questions Related to polymer

Multiple choice chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

Which of the following polymers can be made by anionic addition polymerisation mechanism ?

  1. PVC

  2. PAN

  3. Telfon

  4. PP
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Anionic addition polymerization is a form of chain-growth polymerization or addition polymerization that involves the polymerization of vinyl monomers with strong electronegative groups. This polymerization is carried out through a carbanion active species. 


Like all chain-growth polymerizations, it takes place in three steps: chain initiation, chain propagation and chain termination. 

Characteristics: In order for polymerization to occur with vinyl monomers, the substituents on the double bond must be able to stabilize a negative charge. Stabilization occurs through delocalization of the negative charge. The delocalisation of electron density can be done by Electron withdrawing group such as $CN$, $-F$, $-Cl$ etc.
The solvent is determined by the reactivity of both the initiator and carbanion of the propagating chain end.

Hence, polymers that can be made by anionic addition polymerisation mechanism are PVC, PAN and Teflon.

Multiple choice chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

The main advantage of 'PVC' pipes for drainage is the feasibility of:

  1. mechanical laying

  2. physical laying

  3. chemical laying
  4. both $B$ and $C$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PVC pipes are lightweight, can be easily joined with solvents, and allow for fast mechanical installation using simple tools and fittings. This mechanical laying advantage is significant for drainage systems. Physical laying is not a standard term. Chemical laying is not relevant. The question focuses on the installation method advantage.

Multiple choice chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

Which of the following alkenes is most reactive towards cationic polymerization?

  1. ${ CH } _{ 2 }$ = ${ CHCH } _{ 3 }$
  2. ${ CH } _{ 2 }$ = $CHCl$
  3. ${ CH } _{ 2 }$ = ${ CHC } _{ 6 }{ H } _{ 5 }$
  4. ${ CH } _{ 2 }$ = ${ CHCOOCH } _{ 3 }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In cationic polymerization the most stable cation will show the highest reactivity.

The order of reactivity will be-

$CH _2 = CH-C _6H _5 > CH _2  = CHCH _3 > CH _2 = CHCl >CH _2 = CHCOOCH _3$

Option C is correct.

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

The commercial name of polyacrylonitrile is:

  1. dacron

  2. orlon (acrilan)

  3. PVC

  4. bakelite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The commercial name of polyacrylonitrile is orlon or acrilan,

The addition polymerisation of acrylonitrile in presence of a peroxide catalyst leads to the formation of polyacrylonitrile. Polyacrylonitrile is used as a substitute for wool in making commercial fibers.

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

Few polymers are matched with their uses. Point out the wrong match.

  1. Polyester - Fabric, tyre cords, safety belts

  2. Nylon 6 - Ropes, tyre cords, fabrics

  3. Bakelite - Packaging industry, lubricant

  4. Teflon - Oil seals, gaskets, non-stick utensils
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Uses of bakelite:

  • For making combs, phonograph records, electrical switches,
  • For making handles of various utensils,
  • Paints

So the incorrect option is [C}.

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

Match the column I with column II and mark the appropriate choice.

Column I Column II
(A) Raincoats, hand bags (i) PHBV
(B) Laminated sheets (ii) PVC
(C) Television cabinets (iii) Urea-formaldehyde resin
(D) Orthopaedic devices (iv) Polystyrene
  1. (A) $\rightarrow$ (i), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (iv)
  2. (A) $\rightarrow$ (iv), (B) $\rightarrow$ (i), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (iii)
  3. (A) $\rightarrow$ (ii), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (iv), (D) $\rightarrow$ (i)
  4. (A) $\rightarrow$ (iii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (i), (D) $\rightarrow$ (ii)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 Raincoats, handbags  (ii) PVC
 Laminated sheets  (iii) Urea-formaldehyde resin
 Television cabinets  (iv) Polystyrene
 Orthopedic devices  (i) PHBV

Uses of polyesters- it is crease resistant and is used in blending with cotton and wool fibers and also as glass reinforcing materials in safety helmets, etc.

So the correct option is [C}.

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

Novolac on heating with formaldehyde undergoes _______ to form an infusible solid mass called _______.

  1. polymerization, melamine

  2. vulcanization, resin

  3. cross-liking, bakelite

  4. condensation, polystyrene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

On heating with formaldehyde undergoes crosslinking and form a thermosetting polymer named as$bakalite$.

These are obtained by the condensation reaction of phenol with formaldehyde in the presence of either an acid or a base catalyst. The reaction starts with the initial formation of $o-and/or p-hydroxymethylphenol$ derivatives, which further react with phenol to form compounds having rings joined to each other through –CH2 groups. The initial product could be a linear product – Novolac used in paints.
The correct option is [C].

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

What are blended fibres?

  1. Mixture of two natural fibres

  2. Mixture of two synthetic fibre

  3. Mixture of natural and synthetic fibres

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blended fibres are made by combining various fibres to enhance the property of the product. For eg: spandex and cotton is a natural mix for sports clothing and undergarments to improve stretching properties and prevent odour. A blended fabric helps overcome the disadvantages of natural and synthetic fibre.

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

$C{F} _{2} = C{F} _{2}$ is a monomer of:

  1. Teflon

  2. Orlon

  3. Polythene

  4. Nylon-6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tetrafluorothylene $C{F} _{2} = C{F} _{2}$ is a monomer of Teflon $ { \left( -C{ F } _{ 2 }-C{ F } _{ 2 }- \right)  } _{ n }$.


             $n  C{ F } _{ 2 } = C{ F } _{ 2 }   \rightarrow   { \left( -C{ F } _{ 2 }-C{ F } _{ 2 }- \right)  } _{ n }$