Test Questions & Answers Synthetic Polymers Ch28

Organic Chemistry, 6e (Smith)

Chapter 28 Synthetic Polymers

1) Which of the following monomers yields the polymer shown below?

A) A

B) B

C) C

D) D

2) Which of the following is the repeating unit in polyvinyl chloride (PVC)?

A) A

B) B

C) C

D) D

3) Which of the following is (are) addition polymer(s)?

I. polypropylene

II. Teflon

III. nylon

A) Only I

B) Only II

C) Only III

D) Both I and II

4) Which of the following is (are) condensation polymer(s)?

I. polypropylene

II. Teflon

III. nylon

A) Only I

B) Only II

C) Only III

D) Both II and III

5) Which one of the following monomers undergoes cationic polymerization most readily?

A) H2C=CH2

B) H2C=CHCH3

C) H2C=C(CH3)2

D) H2C=CHCN

6) Which one of the following monomers undergoes anionic polymerization most readily?

A) H2C=CH2

B) H2C=CHCH3

C) H2C=C(CH3)2

D) H2C=CHCN

7) In which type of polymer are the chains packed less tightly together, resulting in lower melting points and a softer texture?

A) Isotactic polymers

B) Syndiotactic polymers

C) Atactic polymers

D) Cross-linked polymers

8) Which of the following best describes the polymer chain shown below?

A) Atactic polypropylene

B) Isotactic polypropylene

C) Syndiotactic polypropylene

D) Cross-linked polypropylene

9) Which of the following is used to make Teflon?

A) Fluoroethene

B) 1,1,4,4-Tetrafluorobutadiene

C) 1,2-Difluoroethene

D) Tetrafluoroethylene

10) Which of the following best describes the polymer chain shown below?

A) Atactic polypropylene

B) Isotactic polypropylene

C) Syndiotactic polypropylene

D) Cross-linked polypropylene

11) The monomer used to make superglue is shown below. Which of the following methods of polymerization is most suitable for this type of monomer?

A) Free-radical chain-growth

B) Cationic chain-growth

C) Anionic chain-growth

D) Acid-catalyzed step-growth

12) Which type of polymerization process uses benzoyl peroxide (or other peroxides) as an initiator?

A) Free-radical chain-growth

B) Cationic chain-growth

C) Anionic chain-growth

D) Acid-catalyzed step-growth

13) Which of the following is the monomer that gives the polymer shown below?

A) A

B) B

C) C

D) D

14) What modification occurs when a small amount of p-divinylbenzene is added to the polymerization reaction of styrene to form polystyrene? (Recall that the vinyl group is —CH=CH2.)

A) Cross-linking of the polystyrene

B) Isotactic stereochemistry of the polystyrene

C) Syndiotactic stereochemistry of the polystyrene

D) "Softening" of the polystyrene by a plasticizer

15) Identify the repeating unit in the polymer formed from the following reaction sequence.

A) A

B) B

C) C

D) D

16) The acid-catalyzed dimerization of isobutylene gives a mixture of two isomeric alkenes, A and B. Hydrogenation of this mixture gives a single C8H18 hydrocarbon. What is the structure of this hydrocarbon?

A) 2,2,4-Trimethylpentane

B) 2,3,4-Trimethylpentane

C) 2,4-Dimethylhexane

D) 2,5-Dimethyhexane

17) The repeating unit of poly(methyl methacrylate) is shown below. Which one of the following is the monomer used to make poly(methyl methacrylate)?

A) A

B) B

C) C

D) D

18) Which of the following monomers is used to make the polymer carbowax, shown below?

A) A

B) B

C) C

D) D

19) Which of the following initiators can be used for anionic chain-growth polymerization?

A) Benzoyl peroxide

B) CH3CH2CH2CH2Li

C) BF3

D) Al(CH2CH3)3, TiCl4

20) Which of the following initiators can be used for free radical chain-growth polymerization?

A) Benzoyl peroxide

B) CH3CH2CH2CH2Li

C) BF3

D) Al(CH2CH3)3, TiCl4

21) Which of the following initiators is used to make isotactic polypropylene?

A) Benzoyl peroxide

B) CH3CH2CH2CH2Li

C) BF3

D) Al(CH2CH3)3, TiCl4

22) The repeating unit of a polymer is shown below. This polymer is formed by

A) addition of ethylene.

B) addition of trans-2-butene.

C) 1,2 addition of butadiene.

D) 1,4 addition of butadiene.

23) Vulcanization is the process of cross-linking polymer chains in rubber using what chemical?

A) Sulfur

B) Formaldehyde

C) Benzoyl peroxide

D) Ethylene glycol

24) What monomer(s) would be used to make the polyester shown below?

A) Butanedioic acid

B) 4-Hydroxybutanal

C) 4-Hydroxybutanoic acid

D) Butanedioic acid and 1,4-butanediol

25) Which of the following is the repeating unit of the polymer formed in the polymerization of p-hydroxybenzoic acid?

A) A

B) B

C) C

D) D

26) Identify the monomer(s) needed to make the following polyester.

A) 3-Hydroxybutanoic acid

B) Butanedioic acid

C) Butanedioic acid and ethylene glycol

D) Butanedioic acid and ethanol

27) Which of the following is (are) repeating unit(s) of step-growth polymers?

A) Only I

B) Only II

C) Only III

D) I and II

28) Bakelite is formed by the acid-catalyzed polymerization of phenol with formaldehyde. What is (are) the product(s) of the first step in this polymerization, shown below? (Note: in the answers below the hydroxymethyl group is -CH2OH.)

A) Ortho and para-hydroxybenzaldehyde

B) Meta-hydroxybenzaldehyde

C) Ortho and para-(hydroxymethyl)phenol

D) Meta-(hydroxymethyl)phenol

29) What is the purpose of plasticizers?

A) To harden plastics

B) To soften plastics

C) To initiate polymerizations

D) To cross-link polymer chains

30) Which of the following is the repeating unit of the polymer formed in the polymerization reaction shown below?

A) A

B) B

C) C

D) D

31) What is the name given to polymers that soften when heated and harden when cooled?

A) Cross-linked polymers

B) Copolymers

C) Thermosetting polymers

D) Thermoplastics

32) What is the structure of the polymer which results when styrene is reacted with BF3 and H2O?

A) A

B) B

C) C

D) D

33) Rank the following monomers (X, Y and Z) in order of increasing ability to undergo anionic polymerization, starting with the least reactive monomer.

A) Y< X < Z

B) Z < Y < X

C) X < Y < Z

D) Y < Z < X

34) Melamine and formaldehyde combine to form the polymer, Melmac®. How is Melmac® classified, and what physical characteristics are consistent with its structure?

A) Polycarbonate, transparent

B) Polyurethane, elastic

C) Thermosetting, rigid

D) Thermoplastic, can be melted and molded into new shapes

35) Which monomer and which type of initiator would you use to synthesize the following polymer?

A) A

B) B

C) C

D) D

E) E

36) Which of the following sets of products results if nylon 66 is treated with sulfuric acid?

A) A

B) B

C) C

D) D

37) What is the classification of the following polymer in which X and Y represent repeating units?

A) Block copolymer

B) Homopolymer

C) Alternating copolymer

D) Random copolymer

38) What is the classification of the following polymer in which X and Y represent repeating units?

A) Block copolymer

B) Homopolymer

C) Alternating copolymer

D) Random copolymer

39) What is the classification of the following polymer in which X and Y represent repeating units?

A) Block copolymer

B) Homopolymer

C) Alternating copolymer

D) Random copolymer

40) What is the name given to polymers with single monomers?

A) Homopolymers

B) Copolymers

C) Block polymers

D) Random polymers

41) What is the name given to polymers with two or more different monomers?

A) Homopolymers

B) Copolymers

C) Block polymers

D) Random polymers

42) What are the structures of the three monomers needed to synthesize the following polymer? 

A) I

B) II

C) III

D) IV

43) What type of polymer is Lexan?

A) Epoxy

B) Polyurethane

C) Polycarbonate

D) Polyamide

44) What type of polymer is Nylon?

A) Epoxy

B) Polyurethane

C) Polycarbonate

D) Polyamide

45) What type of polymer is Spandex?

A) HDPE

B) Polyurethane

C) Polycarbonate

D) Polyamide