945 + Interview Questions in POLYMERS IN GENERAL AWARENESS Page 1 InterviewSolution

1.	The bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an exmaple of:A. Aromatic electrophilic substitutionB. Aromatic nucleophilic substitutionC. Free radical reactionD. Aldol reaction
Answer» Correct Answer - A Definition .

Discussion

2.	Of the following which is a step growth polymer?A. BakeliteB. PolyethyleneC. TeflonD. PVC
Answer» Correct Answer - A

Discussion

3.	Polyacrylonitile is an exmaple of:A. addition polymerB. condensation polymerC. natural polymerD. None of these
Answer» Correct Answer - A

Discussion

4.	Of the following which is a step growth polymer?A. BakeliteB. PolythyleneC. TeflonD. PVC
Answer» Correct Answer - A It is condensation polymer .

Discussion

5.	Which one of the following is not an exmaple of chain growth polymer?A. NeopreneB. Buna-SC. PMMAD. Glyptal
Answer» Correct Answer - C

Discussion

6.	Which is an exmaple of thermosetting polymer?A. PolytheneB. NeopreneC. PVCD. Bakelite
Answer» Correct Answer - D Definition

Discussion

7.	Which type of polymer is cellulose diacetate fibre ?A. SyntheticB. NaturalC. Semi-syntheticD. None of these
Answer» Correct Answer - C Cellulose diacetate ( used in making threads ) is a semi-synthetic polymer as it is obtained from natural polymer (i.e., cellulose ) by chemical modification .

Discussion

8.	Cellulose is a polymer ofA. Glucose and fructoseB. fructoseC. riboseD. sucrose
Answer» Correct Answer - A Cellulose is a polymer of glucose .`beta-D-(+)-glucose` units are attached to each other by `C_(1)` to `C_(4)` bonds through `Beta-glycosidic` linkagle in structure of cellulose.

Discussion

9.	Alizarin is an example ofA. triaryl dyeB. azo dyeC. vat dyeD. anthraquinone dye
Answer» Correct Answer - D Alizarin is an anthraquinone dye. If gives a bright red colour with alumininm and a blue colour with barium.

Discussion

10.	2,4-Dichlorphenoxyacetic acid is used asA. fungicideB. insecticideC. herbicideD. moth repellant
Answer» Correct Answer - C 2, 4-D ro 2, 4-dichlorophenoxyacetic acid is used as a herbicides.

Discussion

11.	Natural rubber and gutta-percha respectively areA. cis-polyisoprene and trans-polyisopreneB. both are cis-polyisopreneC. both are trans-polyisopreneD. trans-polychoroprene and cis polychloroprene and cis-polychichloroprene
Answer» Correct Answer - A Natural rubber is cis-polyisoprene while gutta-parcha is trans-polyosoprene.

Discussion

12.	Hydrolysis of sucrose with dilute aqueous sulphuric acid yieldsA. 1:1 D-(+)-glucose, D-(-)-fructoseB. 1:2 D-(+)-glucose, D-(-)-fructoseC. 1:1 D-(-)-glucose, D-(+)-tructoseD. 1:2 D-(-)-glucose, D-(+)-fructose
Answer» Correct Answer - A On hydrolysis with dilute aqueous sulphuric acid, sucrose gives a equimolar mixture of D-(+)-glucose and D-(-)-fructose. `C_(12)underset"Sucrose"(H_(22))O_(11)+ H_(2)Ooverset(H_(2)SO_(4))rarrunderset"D-(+)-glucose"C_(6)H_(12)O_(6) + underset"D-(-)-fructose"C_(6)H_(12)O_(6)` Sucrose is dexlrorotatory but after hydrolysis , it gives dextrorotatory glucose and laevorotatory fructose. Laevorotatory fructose is more, so the mixture is laevorotatory.

Discussion

13.	Which of the following alkenes is most reactive towards cationic polymerization?A. `H_(2)C=CHCH_(3)`B. `H_(2)C=CHCl`C. `H_(2)C=CHC_(6)H_(5)`D. `H_(2)C=CHCO_(2)CH_(3)`
Answer» Correct Answer - C

Discussion

14.	Which of the following monomers would be most reactive towards cationic polymerization?A. `CH_(2)=CH-OCH_(3)`B. `CH_(2)=CH-CN`C. `CH_(2)=CH-NO_(2)`D. `CH_(2)=CH-CH_(3)`
Answer» Correct Answer - A

Discussion

15.	Which of the following is cross-linked or network polymer?A. Polyvinyl chlorideB. High density polytheneC. BakeliteD. Low density polythene
Answer» Correct Answer - C Polyvinyl chloride and high density polyethene are examples of linear polymers as they consist of long and straight chains. Low density polyethene is an example of branched chain polymer because it contains linear chains having some branches. Bakelite is an example of cross-linked or network polymer because it contains strong covalent bonds between various linear polymer chains

Discussion

16.	Define thermoplastics and thermosetting polymers with two examples of each.
Answer» Thermoplastics polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again. Examples include polyethylene, polystyrene. Thermosetting polymers are cross-linked or heavily branded polymers which get hardened during moulding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins.

16.

Define thermoplastics and thermosetting polymers with two examples of each.

Answer»

Thermoplastics polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again. Examples include polyethylene, polystyrene.

Thermosetting polymers are cross-linked or heavily branded polymers which get hardened during moulding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins.

Discussion

17.	The polymers made by addition polymerization from two different monomers are termed asA. addition polymersB. copolymersC. condensation polymersD. homopolymers
Answer» Correct Answer - B Addition polymers are formed when monomer molecules possessing double or triple bonds undergo repeated addition,. They are of two kinds. The addition polymers formed by the polymerisation of a single monomeric species are known as homopolymers e.g. polyethene while the addition polymers made by addition polymerisation form two different monomers are termed as copolymers, e.g., Buna - S rubber. On the other hand, the condensation polymers are formed when two different bi-functional monomeric units undergo repeated condensation reactions. Such polymers are always copolymers

Discussion

18.	Magnitude of intermolecular forces is maximum in case ofA. fibresB. elastomersC. thermoplasticsD. thermosetting polymers
Answer» Correct Answer - A The order of intermolecular forces is Fibre gt Thermosetting gt Thermoplastics gt Elastomers.

Discussion

19.	Which of the following is not thermoplastic polymer .A. PolyetheneB. NeopreneC. Polyvinyl chlorideD. Polypropene
Answer» Correct Answer - B

Discussion

20.	Thermoplastics are the polymersA. that can be moulded at room temperature of above but when heated more strongly become hard infusible dut ot formation of cross-links between the polymers chains.B. that are hard at room temperature but on heating became soft and viscous, and can be mouldedC. that are amorphous and have elastic properties.D. from which fibres used in textiles can be made
Answer» Correct Answer - B The intemolecular forces of attraction in thermoplastic polymers are intermediate between elastomers and fibres. As a result, these can he easily mouled by heating.

Discussion

21.	Which of the following is an example of thermoplastic polymer?A. BakeliteB. MelmacC. Urea-formaldehyde resinD. Celluloid
Answer» Correct Answer - D Celluloid is a little used inflammable thermoplastic based on cellulose nitrate plasticized with camphor.

Discussion

22.	Which of the following is incorrect for addition polymerisation?A. In this type of polymerisation, the molecules of the same monomer of different monomers simply add together on a large scale to from a polymerB. The monomers used are unsaturated compoundsC. This mode of polymerisation can take place only through formation of free radicalsD. This process of polymerisation is also called chain growth polymerisation is also called chain growth polymerisation
Answer» Correct Answer - C This mode of polymerisation can take place through formation of either radicals or ionic species such as carbon ions or carbocation. However, the free radical governed addition polymersiation is the most common mode. This process which involves unsturated compounds such as alkenes, alkadines and their derivatives is aslo called chain growth polymerisation because it takes place through stages leading to increase of chain length and each stage produces reactive intermediate for use in the next stage of the growth of the chain.

Discussion

23.	Which of the following does not act as a free radical generating initiator ?A. Acetyl peroxideB. Benzoyl peroxideC. Tert-butyl peroxideD. Ethyl alcohol
Answer» Correct Answer - D Ethyl alcohol never acts as a free radical generating initiator.

Discussion

24.	Name a compound that is used as an initiator in the free radical polymerisation.
Answer» Benzoyl peroxide `(Ph-oversetoverset(O)(\|\|)C-O-O-oversetoverset(O)(\|\|)C-Ph)`

Discussion

25.	Which one of the following is the initiator in a cationic polymerisation-A. `LiAlH_4`B. `HNO_3`C. `AlCl_3`D. BuLi
Answer» Correct Answer - C

Discussion

26.	Which one is the initiator in a cationic polymerisation-A. `LiAlH_4`B. `HNO_3`C. `AlCl_3`D. BuLi
Answer» Correct Answer - C

Discussion

27.	Name any two monomers that talce part in anionic polymerisation. Why is anionic polymerisation also known as living polymerisation? Explain.
Answer» First part : acrylonitrile , styrene

Discussion

28.	Name a compound that is used as an initiator in anionic polymerisation.
Answer» Correct Answer - Butyllithium (BuLi)

Discussion

29.	Which of the following vinyl derivative is most reactive toward anionic polymerisation ?A. `CH_(2)=CHCH_(3)`B. `CH_(2)=CHC_(2)H_(5)`C. `CH_(2)=CHCl `D. `CH_(2)=CHC-=N `
Answer» Correct Answer - D Electron withdrawing groups make the monomer more reactive towards anionic polymerisation . Hence , acrylonitrile is most reactive .

Discussion

30.	Which of the following alkenes is least reactive towards anionic polymerisation ?A. `CH_(2)=CHCH_(3) `B. `CH_(2)=CF_(2)`C. `CH_(2)=CHCN`D. `CH_(2)=CHC_(6)H_(5)`
Answer» Correct Answer - A In anionic polymerisation , ( on reaction with `KNH_(2)`) carbanions are the intermediates. Greater the stability of the carbanion, more reactive is the alkene. Since the stability of the carbonions decreases in the order : `H_(2)N-CH_(2)-overset(-)CHCN gt H_(2)NCH_(2)overset(-)CF_(2) gt H_(2)NCH_(2)overset(-)CHC_(6)H_(5) gt H_(2)NCH_(2)overset(-)CHCH_(3)`, therefore , the reactivity decreases in the same order . Thus `CH_(2)=CHCH_(3)` is least reactive.

Discussion

31.	Which of the following polymers of glucose is stored by animals?A. CelluloseB. AmyloseC. AmylopectinD. Glycogen
Answer» Correct Answer - D Glycogen , a polymer of glucose is stored in animal body.

Discussion

32.	Melamine formaldehhyde resin isA. an addition polymerB. a copolymerC. a fibre type polymerD. dimer of melamine and formaldehyde
Answer» Correct Answer - D Melamine-formaldehyde resin is a copolymer.

Discussion

33.	Under hydrolysis conditions, the compounds used for preparation of linear polymer and for chain termination, respectively areA. `CH_(3)SiCl_(3) and Si(CH_(3))_(4)`B. `(CH_(3))_(2)SiCl_(2) and (CH_(3))_(3)SiCl`C. `(CH_(3))_(2)SiCl_(2) and CH_(3)SiCl_(3)`D. `SiCl_(4) and (CH_(3))_(3)SiCl`
Answer» Correct Answer - B

Discussion

34.	Depict a free radical mode of addition polymerisation in isoprene.
Answer» Free radical polymerisation in isoprene is initiated by a free radical attack. `underset(("Free radical"))(R^(.) + )CH_(2) = underset(CH_(3))underset(\|)(C) - CH = CH_(2) rarr R - CH_(2) - underset(("Free radical"))underset(CH_(3))underset(\|)(C) = CH - CH_(2)` Free radicals participate in further polymerisation.

Discussion

35.	Among cellulose, poly (vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest isA. nylonB. polyvinyl chlorideC. celluloseD. natural rubber
Answer» Correct Answer - D These are weakest in natural rubber. This is quit evident from the fact natural rubber is very soft and elastic

Discussion

36.	The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. nylon -66C. RayonD. Terflon
Answer» Correct Answer - B

Discussion

37.	The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. `barO OC - (CH_(2))_(4) - CObarO overset(+)(N) H_(3) - (CH_(2))_(6) - overset(+)(N)H_(3)`B. `-overset(O)overset(\|\|)(C) - (CH_(2))_(4) - overset(O)overset(\|\|)(C)- NH - (CH_(2))_(6) - NH-`C. `H_(3) overset(+)(N) - (CH_(2))_(5) - overset(+)(N)H_(3) barO O C - (CH_(2))_(4) - CO barO`D. `H_(2)N - (CH_(2))_(6) - overset(+)(N) H_(3) barO - overset(\|\|)(O) - (CH_(2))_(4) - overset(O)overset(\|\|)(C)- OH`
Answer» Correct Answer - A

Discussion

38.	The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. Nylon 66C. RayonD. Teflon
Answer» Correct Answer - B `H_(2) N(CH_(2))_(6) NH_(2) + COOH (CH_(2))_(4) COOH to ` Nylon 66.

Discussion

39.	The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. dacronB. nylon-6,6C. rayonD. teflon
Answer» Correct Answer - B

Discussion

40.	The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. Nylon -66C. rayonD. Teflon
Answer» Correct Answer - B

Discussion

41.	Gutta percha isA. trans-Polyisoprene B. A synthetic polymerC. A very hard materialD. All statement are correct
Answer» Correct Answer - D Property of Gutta percha which is polymer of isoprene .

Discussion

42.	Gutta percha isA. trans-PolyisopreneB. A synthetic polymerC. A very hard materialD. All statement are correct
Answer» Correct Answer - D Property of Gutta percha which is polymer of isoprene .

Discussion

43.	Assertion `:` Buta `-1,3-`diene is the monomer of Gutta Percha. Reason`:` Gutta Percha is formed through cationic addition polymerisation.A. If both A and R are correct and R is the correct explanation of A.B. If both A and R are correct and R is not the correct explanation of A.C. If A is the correct but R is incorect.D. If A is the incorrect but R is corect.
Answer» Correct Answer - D

Discussion

44.	An example of synthetic polymer isA. nylonB. teflonC. polytheneD. all of these
Answer» Correct Answer - D Nylon , Teflon and Polythene are synthetic fibre .

Discussion

45.	Which of the following is not a polyamide?A. WoolB. LeatherC. NylonD. Natural rubber
Answer» Correct Answer - D Wool , Leather , Nylon contain amide group . Natural rubber is vegetable product .

Discussion

46.	Silk is aA. polypeptideB. polysaccharidesC. polyethyleneD. polyvinyl chloride
Answer» Correct Answer - A Silk is protein fibre contain peptide linkage .

Discussion

47.	Polymer used in bulllet proof glass isA. PMMAB. lexanC. nomexD. kevlar
Answer» Correct Answer - A

Discussion

48.	Polymer used in bullet proof glass is:A. PMMAB. lexanC. nomexD. kevlar
Answer» Correct Answer - B

Discussion

49.	Nylon -66 is a copolymer ofA. urea and fomaldehydeB. hexamethylene diamine and adipic acidC. phenol and formaldehydeD. vinyl chloride and vinyl alcohol .
Answer» Correct Answer - B It is polymer of two monomers ` H_2N(CH_2)_6NH_2 and HOOC(CH_2)_4 COOH` . It is a polyamide , because it has amide linkage i.e (-CONH-) linkages .

Discussion

50.	Which of the following is an addition homopolymer ?A. PolytheneB. teflonC. PVCD. All the three above
Answer» Correct Answer - D All of them are polymer of same type of monomer ethylene , tetrafluoro ethylene and vinyl chloride respectively.

Discussion

Explore topic-wise InterviewSolutions in .

The bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an exmaple of:A. Aromatic electrophilic substitutionB. Aromatic nucleophilic substitutionC. Free radical reactionD. Aldol reaction

Of the following which is a step growth polymer?A. BakeliteB. PolyethyleneC. TeflonD. PVC

Polyacrylonitile is an exmaple of:A. addition polymerB. condensation polymerC. natural polymerD. None of these

Of the following which is a step growth polymer?A. BakeliteB. PolythyleneC. TeflonD. PVC

Which one of the following is not an exmaple of chain growth polymer?A. NeopreneB. Buna-SC. PMMAD. Glyptal

Which is an exmaple of thermosetting polymer?A. PolytheneB. NeopreneC. PVCD. Bakelite

Which type of polymer is cellulose diacetate fibre ?A. SyntheticB. NaturalC. Semi-syntheticD. None of these

Cellulose is a polymer ofA. Glucose and fructoseB. fructoseC. riboseD. sucrose

Alizarin is an example ofA. triaryl dyeB. azo dyeC. vat dyeD. anthraquinone dye

2,4-Dichlorphenoxyacetic acid is used asA. fungicideB. insecticideC. herbicideD. moth repellant

Natural rubber and gutta-percha respectively areA. cis-polyisoprene and trans-polyisopreneB. both are cis-polyisopreneC. both are trans-polyisopreneD. trans-polychoroprene and cis polychloroprene and cis-polychichloroprene

Hydrolysis of sucrose with dilute aqueous sulphuric acid yieldsA. 1:1 D-(+)-glucose, D-(-)-fructoseB. 1:2 D-(+)-glucose, D-(-)-fructoseC. 1:1 D-(-)-glucose, D-(+)-tructoseD. 1:2 D-(-)-glucose, D-(+)-fructose

Which of the following alkenes is most reactive towards cationic polymerization?A. `H_(2)C=CHCH_(3)`B. `H_(2)C=CHCl`C. `H_(2)C=CHC_(6)H_(5)`D. `H_(2)C=CHCO_(2)CH_(3)`

Which of the following monomers would be most reactive towards cationic polymerization?A. `CH_(2)=CH-OCH_(3)`B. `CH_(2)=CH-CN`C. `CH_(2)=CH-NO_(2)`D. `CH_(2)=CH-CH_(3)`

Which of the following is cross-linked or network polymer?A. Polyvinyl chlorideB. High density polytheneC. BakeliteD. Low density polythene

Define thermoplastics and thermosetting polymers with two examples of each.

The polymers made by addition polymerization from two different monomers are termed asA. addition polymersB. copolymersC. condensation polymersD. homopolymers

Magnitude of intermolecular forces is maximum in case ofA. fibresB. elastomersC. thermoplasticsD. thermosetting polymers

Which of the following is not thermoplastic polymer .A. PolyetheneB. NeopreneC. Polyvinyl chlorideD. Polypropene

Which of the following is an example of thermoplastic polymer?A. BakeliteB. MelmacC. Urea-formaldehyde resinD. Celluloid

Which of the following does not act as a free radical generating initiator ?A. Acetyl peroxideB. Benzoyl peroxideC. Tert-butyl peroxideD. Ethyl alcohol

Name a compound that is used as an initiator in the free radical polymerisation.

Which one of the following is the initiator in a cationic polymerisation-A. `LiAlH_4`B. `HNO_3`C. `AlCl_3`D. BuLi

Which one is the initiator in a cationic polymerisation-A. `LiAlH_4`B. `HNO_3`C. `AlCl_3`D. BuLi

Name any two monomers that talce part in anionic polymerisation. Why is anionic polymerisation also known as living polymerisation? Explain.

Name a compound that is used as an initiator in anionic polymerisation.

Which of the following vinyl derivative is most reactive toward anionic polymerisation ?A. `CH_(2)=CHCH_(3)`B. `CH_(2)=CHC_(2)H_(5)`C. `CH_(2)=CHCl `D. `CH_(2)=CHC-=N `

Which of the following alkenes is least reactive towards anionic polymerisation ?A. `CH_(2)=CHCH_(3) `B. `CH_(2)=CF_(2)`C. `CH_(2)=CHCN`D. `CH_(2)=CHC_(6)H_(5)`

Which of the following polymers of glucose is stored by animals?A. CelluloseB. AmyloseC. AmylopectinD. Glycogen

Melamine formaldehhyde resin isA. an addition polymerB. a copolymerC. a fibre type polymerD. dimer of melamine and formaldehyde

Under hydrolysis conditions, the compounds used for preparation of linear polymer and for chain termination, respectively areA. `CH_(3)SiCl_(3) and Si(CH_(3))_(4)`B. `(CH_(3))_(2)SiCl_(2) and (CH_(3))_(3)SiCl`C. `(CH_(3))_(2)SiCl_(2) and CH_(3)SiCl_(3)`D. `SiCl_(4) and (CH_(3))_(3)SiCl`

Depict a free radical mode of addition polymerisation in isoprene.

Among cellulose, poly (vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest isA. nylonB. polyvinyl chlorideC. celluloseD. natural rubber

The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. nylon -66C. RayonD. Terflon

The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. Nylon 66C. RayonD. Teflon

The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. dacronB. nylon-6,6C. rayonD. teflon

The fibre obtained by the condensation of hexamethylen, diamine and adipic acid isA. DacronB. Nylon -66C. rayonD. Teflon

Gutta percha isA. trans-Polyisoprene B. A synthetic polymerC. A very hard materialD. All statement are correct

Gutta percha isA. trans-PolyisopreneB. A synthetic polymerC. A very hard materialD. All statement are correct

An example of synthetic polymer isA. nylonB. teflonC. polytheneD. all of these

Which of the following is not a polyamide?A. WoolB. LeatherC. NylonD. Natural rubber

Silk is aA. polypeptideB. polysaccharidesC. polyethyleneD. polyvinyl chloride

Polymer used in bulllet proof glass isA. PMMAB. lexanC. nomexD. kevlar

Polymer used in bullet proof glass is:A. PMMAB. lexanC. nomexD. kevlar

Nylon -66 is a copolymer ofA. urea and fomaldehydeB. hexamethylene diamine and adipic acidC. phenol and formaldehydeD. vinyl chloride and vinyl alcohol .

Which of the following is an addition homopolymer ?A. PolytheneB. teflonC. PVCD. All the three above