Tag: petrochemicals and polymers

Questions Related to petrochemicals and polymers

Which of the following is not polyamide?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. Nylon-6

  2. Nylon-66

  3. Protein

  4. Glyptal

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Correct Option: D
Explanation:

Glyptal is not a polyamide. It is an alkyd resin obtained from polyhydric alcohols and polybasic organic acids or their anhydrides; used for surface coatings .

Polystyrene is an example of ___.

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. elastomer

  2. fibre

  3. cation polymerisation polymer

  4. thermosetting polymer

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Correct Option: C
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 $cation$ $polymerisation$ $polymer$.

The polymer used for post operative stitches is:

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. glycolic acid

  2. poly lactic acid

  3. Nylon -$2$ - Nylon - $6$

  4. PHBV

Show answer
Correct Option: B
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.

Nylon-6, 10 is a polymer of :

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. hexamethylene and adipic acid

  2. hexamethylene and sebacic acid

  3. caprolactam

  4. None of the above

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Correct Option: A

Which polymer describes tail - to - tail addition? 

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  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

Show answer
Correct Option: B
Explanation:
In tail to tail polymerization, $-X$ is located such that it is separated by $H$ atoms.

i.e, $-\underset { | }{ CH } -{ CH } _{ 2 }-{ CH } _{ 2 }-\underset { | }{ CH } -$
          $X$                                    $X$

$2$-chloro-$1$,$3$-butadiene is also known as : -

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. Chloroprene

  2. Neoprene

  3. Isoprene

  4. Buna-N

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Correct Option: A

Which statement about poly(chloroethene) is correct?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  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 $97$.

Show answer
Correct Option: A
Explanation:

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

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?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. 5.4 %

  2. 2.7%

  3. 10.8%

  4. 0.054%

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Correct Option: A

The monomer styrene has structural formula _______.

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. $C _6H _5-CH =CH _2$

  2. $C _6H _5-CH _2 = CH _2$

  3. $C _5H _6 - CH = CH _2$

  4. $C _5H _2-CH _2 = CH _2$

Show answer
Correct Option: A
Explanation:

Styrene, also known as ethenylbenzene is an organic compound with molecular formula $C _6H _5CH=CH _2$

Option (A) is correct.

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

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. PVC

  2. PP

  3. HDPE

  4. LDPE

Show answer
Correct Option: B
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.