Polymers

Q 1.

Name the polymers used in laminated sheets and give the name of monomeric units involved in its formation.

Q 2.

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

Q 3.

Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the polymers with this property collectively called? What are the structural similarities between such polymers? Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.

Q 4.

Write the monomers used for gettingThe following polymers:
(i) Polyvinylchloride
(ii) Teflon (iii) Bakelite

Q 5.

Identify the type of polymer given in the following figure.

Q 6.

Match materials given in Column I with the polymers given in Column II.

Q 7.

Which of the following polymers are used as fibre?
(a) Polytetrafluoroethane (b) Poly chloroprene
(c) Nylon (d) Terylene

Q 8.

Q 9.

Which of the following are characteristics of thermosetting polymers?
(a) Heavily branched cross linked polymers.
(b) Linear slightly branched long chain molecules.
(c) Become infusible on moulding so cannot be reused.
(d) Soften on heating and harden on cooling, can be reused.

Q 10.

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

Q 11.

In which classes, the polymers are classified on the basis of molecular forces?

Q 12.

Write the free radical mechanism for the polymerisation of ethene.

Q 13.

In which of the following polymers ethylene glycol is one of the monomer units?

Q 14.

Assertion (A): Olefinic monomers undergo addition polymerization.
Reason (R): Polymerisation of vinyl chloride is initiated by peroxides/ persulphates.

Q 15.

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

Q 16.

Which of the following monomers form biodegradable polymers?
(a) 3-hydroxybutanoic acid +3-hydroxypentanoic acid
(b) Glycine + aminocaproic acid  
(c) Ethylene glycol + phthalic acid
(d) Caprolactam

Q 17.

What are polymers?

Q 18.

Assertion (A): Polyamides are best used as fibres because of high tensile strength.
Reason (R): Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers.

Q 19.

Which of the following polymers are thermoplastic?
(a) Teflon (b) Natural rubber (c) Neoprene (d) Polystyrene

Q 20.

Which of the following polymers are condensation polymers?
(a) Bakelite (b) Teflon
(c) Butyl rubber (d) Melamine formaldehyde resin

Q 21.

Write the names and structures of the monomers of the following polymers:
(i) Buna-S (ii) Buna-N (iii) Dacron (iv) Neoprene

Q 22.

What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.

Q 23.

Assertion (A): For making rubber synthetically, isoprene molecules are polymerised.
i Reason (R): Neoprene (a polymer of chloroprene) is a synthetic rubber.

Q 24.

How are polymers classified on the basis of structure?

Q 25.

Can nucleic acids, proteins and starch be considered as step growth polymers?

Q 26.

Match the polymers given in Column I with their main applications given in Column II.

Q 27.

Which of the following polymer is biodegradable?

Q 28.

Discuss the main purpose of vulcanisation of rubber.

Q 29.

What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature, hence the use of a polymer?

Q 30.

Differentiate between rubbers and plastics on the basis of intermolecular forces.

Q 31.

What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature, hence the use of a polymer?

Q 32.

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

Q 33.

A natural linear polymer of 2-methyl-l,3-butadiene becomes hard on treatment with sulphur between 373 to 415 K and -S – S – bonds are formed between chains. Write the structure of the product of this treatment?

Q 34.

Which of the following are examples of synthetic rubber?
(a) Polychloroprene (b) Polyacrylonitrile
(c) Buna-N (d) cis-polyisoprene

Q 35.

Assertion (A): Olefinic monomers undergo addition polymerization.
Reason (R): Polymerisation of vinyl chloride is initiated by peroxides/ persulphates.

Q 36.

Can enzyme be called a polymer?

Q 37.

To have practical applications why are cross links required in rubber?

Q 38.

Which type of biomolecules have some structural similarity with synthetic polyamides? What is this similarity?

Q 39.

Assertion (A): Polytetrafluoroethene is used in making non-stick cookware. Reason (R): Fluorine has highest electronegativity.

Q 40.

Classify the following as addition and condensation polymers:
Terylene, Bakelite, Polyvinyl chloride,Polythene

Q 41.

Identify the type of polymer.
-A-B-B-A-A-A-B-A-

Q 42.

Why does cw-polyisoprene possess elastic property?

Q 43.

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

Q 44.

Assertion (A): Network polymers are thermosetting.
Reason (R): Network polymers have high molecular mass.

Q 45.

Explain the difference between Buna- N and Buna-S.

Q 46.

Is  (-NH — CHR—CO-)_n a homopolymer or copolymer?

Q 47.

How is dacron obtained from ethylene glycol and terephthalic acid?

Q 48.

Which of the following are addition polymers?
(a) Nylon (b) Melamine formaldehyde resin
(c) Orion (d) Polystyrene

Q 49.

Which of the following polymers can have strong intermolecular forces?
(a) Nylon (b) Polystyrene (c) Rubber (d) Polyester

Q 50.

Match the polymers of Column I with correct monomers of Column II.