Tag: addition polymerisation

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Questions Related to addition polymerisation

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

Polystyrene is an example of ___.

  1. elastomer

  2. fibre

  3. cation polymerisation polymer

  4. thermosetting polymer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ELASTOMER  -  $Elastomers$ are rubber-like solids with elastic properties.
FIBRE  -  Fibre polymers are the thread forming solids with high tensile strength and high modulus.
THERMOSETTING  POLYMER  - These polymers are cross-linked or heavily branched molecules, which on heating undergo extensive cross-linking in moulds and again become infusible.
POLYSTYRENE - $Polystyrene$ is a thermoplastic polymer. It is formed by cation polymerisation. Hence, it is an example of a $cation$ $polymerisation$ $polymer$.

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

The polymer used for post operative stitches is:

  1. glycolic acid

  2. poly lactic acid
  3. Nylon -$2$ - Nylon - $6$

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

Polylactic acid is a thermoplastic aliphatic polyester derived from renewable resources
Polylactic acid is used for post operative stitches as it breaks down inside the body within $6$ months to $2$ years.

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

Nylon-6, 10 is a polymer of :

  1. hexamethylene and adipic acid

  2. hexamethylene and sebacic acid

  3. caprolactam

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nylon-6,10 is a copolymer synthesized through the condensation reaction of hexamethylenediamine (which contains 6 carbon atoms) and sebacic acid (a dicarboxylic acid containing 10 carbon atoms). Adipic acid is used in the synthesis of Nylon-6,6 instead. Therefore, hexamethylene and sebacic acid are the correct reactants.

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

Which polymer describes tail - to - tail addition? 

  1. $-CH _2-\underset{X}{\underset{|}{CH}}-CH _2-\underset{CH}{\underset{|}{X}}-$
  2. $-\underset{X}{\underset{|}{CH}}-CH _2-CH _2-\underset{X}{\underset{|}{CH}}-$
  3. $-CH _2-\underset{X}{\underset{|}{CH}}-\underset{X}{\underset{|}{CH}}-CH _2-$

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In tail to tail polymerization, $-X$ is located such that it is separated by $H$ atoms.

i.e, $-\underset { | }{ CH } -{ CH } _{ 2 }-{ CH } _{ 2 }-\underset { | }{ CH } -$
          $X$                                    $X$
Multiple choice chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

Which statement about poly(chloroethene) is correct?

  1. The polymer can be cracked to produce chlorinated alkenes

  2. The polymer has harmless combustion products

  3. The polymer is readily biodegradable when buried
  4. The repeat unit of the polymer has an $M _r$ of $97$.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polychloroethene is an addition polymer. Chloroethene can polymerise to form poly(chloroethene). Hence they can be cracked to produce chlorinated alkenes.

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

Lactic acid, $ HC _{3}H _{5} O _{3},$ produced in 1 g sample of muscle tissue was titrated using phenolphthalein as indicator against $OH^{-}$ ions which were obtained by the electrolysis of water. As soon as $ OH^{-} $ ions are produced, they react with lactic acid and at complete neutralization, immediately a pink colour is noticed. If electrolysis was made for 1158 s using 50.0 mA current to reach the end point, what was the percentage of lactic acid in muscle tissue?

  1. 5.4 %

  2. 2.7%

  3. 10.8%

  4. 0.054%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Moles of OH- = (I * t) / F = (0.05 * 1158) / 96500 = 0.0006 moles. Since lactic acid (C3H6O3) is monoprotic, moles of acid = 0.0006. Mass = 0.0006 * 90 g/mol = 0.054 g. Percentage = (0.054 / 1) * 100 = 5.4%.

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

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

  1. PVC

  2. PP

  3. HDPE

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

HDPE (high-density polyethene) and LDPE (low-density polyethene) polymerize by Ziegler-Natta Catalytic Polymerization reaction. 


PVC (polyvinyl chloride) polymerizes by radical polymerization. 

PP (polypropene) polymerizes by the cationic polymerization reaction.