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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Why should the monomers used in addition polymerisation through free radical pathway be very pure?

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प्रश्न

Why should the monomers used in addition polymerisation through free radical pathway be very pure?

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उत्तर

Pure monomers are required because even the traces of impurities may act as initiators which leads to the formation of polymers of small chain lengths.

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अध्याय 15: Polymers - Multiple Choice Questions (Type - I) [पृष्ठ २२२]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 15 Polymers
Multiple Choice Questions (Type - I) | Q 37 | पृष्ठ २२२

संबंधित प्रश्न

How are polythene and neoprene prepared?


Write the molecular formula and structural formula of BHA and BHT.

 


Write the mechanism of free radical polymerization of ethene.


Which of the following is a natural polymer ? Buna-S, Proteins, PVC


Write the free radical mechanism for the polymerisation of ethene.


Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following.


What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example.


Match the polymers given in Column I with their chemical names given in Column II.

Column I Column II
(i) Nylon 6 (a) Polyvinyl chloride
(ii) PVC (b) Polyacrylonitrile
(iii) Acrilan (c) Polycaprolactum
(iv) Natural rubber (d) Low-density polythene
(v) LDP (e) cis-polyisoprene

Match the polymers given in Column I with the preferred mode of polymerisation followed by their monomers.

Column I Column II
(i) Nylon-6,6 (a) Free radical polymerisation
(ii) PVC (b) Ziegler-Natta polymerisation or coordination polymerisation
(iii) HDP (c) Anionic polymerisation
  (d) Condensation polymerisation

Assertion: Olefinic monomers undergo addition polymerisation.

Reason: Polymerisation of vinyl chloride is initiated by peroxides/ persulphates.


Assertion: Polytetrafluoroethene is used in making non-stick cookwares.

Reason: Fluorine has highest electronegativity.


Which of the following is chain-growth polymer?


Which one of the following polymers are prepared by addition polymerisation?


Which one of the following polymers is prepared by addition polymerisation? 


Orlon fibres are made up of ______.


\[\ce{X + C + Cl2 ->[High temperature][of about 1000 K] Y + CO}\];

\[\ce{Y + 2H2O -> Z + 2HCl}\]

Compound Y is found in polymeric chain structure and is an electron-deficient Molecule. Y must be:


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