Chapter 30

Which of the following is an elastomer? (a) Dacron (b) Melamine (c) vulcanized rubber (d) polystyrene

Natural silk is a (a) polychloroprene (b) polypeptide (c) polyacrylonitrile (d) polysaccharide

Synthetic rubber (neoprene) is (a) polyamide (b) polyester (c) poly halodiene (d) polysaccharide

A polymer of prop-2-ene nitrile is called (a) Tetron (b) Saran (c) Orlon (d) Dacron

Which one of the following pairs of monomers is used in the manufacture of 'Dacron'? (a) acrylonitrile and vinyl acetate (b) tetephthalic acid and ethylene glycol (c) phthalic acid and ethylene glycol (d) adipic acid and hexamethylene diamine

Which can be used as monomer in a polymerization reaction? (a) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}\)

Consider the following sequence of reactions. \(\mathrm{HC} \equiv \mathrm{CH} \stackrel{\text { (i) } \mathrm{CuCl}, \mathrm{NH}_{4} \mathrm{Cl}, \text { (ii) } \mathrm{HCl}}{\longrightarrow}(\mathrm{X})\) \(\underline{\text { Polymerization }}{\longrightarrow}(\mathrm{Y})\) The polymer (Y) is (a) PVC (b) Saran (c) Neoprene (d) Chloroprene

Which of the following is biodegradable polymer of polyamide class? (a) dextran (b) Nylon-2-Nylon-6 (c) Nylon-6, 6 (d) PHBV

Which of the following is chemical name of 'melamine'? (a) \(1,3,5\)-triamino- \(2,4,6\)-triazine (b) \(2,4,6\)-triamino- \(1,3,5\)-triazine (c) 2 -amino- \(1,3,5\)-triazine (d) 2,4 -diamino- \(1,3,5\)-triazine

Peroxide initiated polymerizations occur via (a) hydrocarbon combustion (b) natural process synthesis (c) isomeric saponification (d) free radical chain propagation

Which of the following statement is incorrect? (1) Vinyon is a copolymer of vinyl chloride and vinyl acetate (2) Saran is a copolymer of vinyl chloride and vinylidene chloride (3) Butyl rubber in a copolymer of isobutylene and isoprene (a) 1 and 2 (b) 2 only (c) 1 only (d) none is incorrect

Which of the following can be remelted time and again without producing any change? (a) Bakelite (b) Urea formaldehyde resin (c) PVC (d) Melamineformaldehyderesin

Latex can be coagulated with? (a) \(\mathrm{CH}_{3} \mathrm{COOH}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CH}_{3} \mathrm{OH}\) (d) All of these

In a polymer sample \(30 \%\) of molecules have a molecular mass \(20,000,40 \%\) have 30,000 and the rest \(60,000 .\) What is the weight average molecular mass of the polymer? (a) 40,300 (b) 30,600 (c) 43,333 (d) 50,400

Which of the following are correct here? (1) ABS plastic (2) Contains three monomers (3) A polymer of acrylonitrile, butadiene and styrene (a) 1 and 2 (b) 3 only (c) 2 only (d) 1,2 and 3

Which is/are correct about PMMA here (I) It is called plexiglass (II) It is hard and transparent (III) For it's formation peroxide is used (IV) It is co-polymer (a) I, II (b) II, III (c) I, II, III (d) I, II, III, IV

Which of the following statement is correct? (a) Vinyon is a copolymer of vinyl chloride and vinyl acetate (b) Saran is a copolymer or vinyl chloride and vinylidene chloride (c) butyl rubber in a copolymer of isobutylene and isoprene (d) all are correct

The monomer of the polymer (a) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}\) (c) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}\) (d) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}\)

Which of the following polymer can be used for lubrication and as an insulator? (a) SBR (b) PVC (c) PTFE (d) \(\mathrm{PAN}\)

Polyacrylonitrile, characterized by the repeating unit is made from which of the following monomer? (a) \(\mathrm{CH}_{2}=\mathrm{CHCN}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CN}\) (c) \(\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCN}\)

The monomer used for the manufacture of PVC is obtained by the addition of (a) \(\mathrm{Cl}_{2}\) to ethylene (b) \(\mathrm{Cl}_{2}\) to acetylene (c) HCl to ethylene (d) HCl to acetylene in presence of \(\mathrm{Hg}^{2+}\) salts

Which of the following are condensation polymers? (1) PAN (2) Neoprene (3) polystyrene (4) Poly (ethylene terephthalate) (a) 1 and 4 only (b) 3 and 4 only (c) 2 and 3 only (d) 4 only

The number average molecular mass and mass average molecular mass of a polymer are respectively 30,000 and \(40,000 .\) The poly dispersity index of the polymer is (a) \(<1\) (b) \(>1\) (c) 1 (d) 0

Polymerization using Zeigler-Natta catalysis is advantageous over free radical polymerization because (a) it gives highly branched polymer with a high degree of crystallinity (b) it gives linear polymer molecules permitting stereochemical control (c) it can lead to living polymers via anionic polymerization (d) it permits step reaction polymerization resulting in a highly cross linked polymer

\(\left[\mathrm{NH}\left(\mathrm{CH}_{2}\right) \mathrm{NHCO}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{CO}\right] \mathrm{n}\) is a (a) thermosetting polymer (b) homopolymer (c) co-polymer (d) addition polymer

Bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an example of (a) free radical reaction (b) aromatic nucleophilic substitution (c) aromatic electrophilic substitution (d) aldol reaction

Which one of the following monomers gives the polymer neoprene on polymerization? (a) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}\) (b) \(\mathrm{CCl}_{2}=\mathrm{CCl}_{2}\) (c)C=CC(=C)Cl (d) \(\mathrm{CF}_{2}=\mathrm{CF}_{2}\)

Which is true about polymers? (1) polymers have low molecular weight (2) polymers have high viscosity (3) polymers scatter light (4) polymers do not carry any charge (a) 1,2 and 3 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,3 and 4

Which of the following statements is correct about polymers? (1) polymers are substances made up of recurring structural units, each of which can be regarded as derived from a specific compound called a monomer (2) polymers made from a single monomeric species are called homopolymers, whereas, those made up of two or more different monomeric species are called copolymers. (3) very often, polymers are macromolecules, and a sample of a given polymer is characteristically a mixture of molecules with different molecular weights (a) 1 and 2 only (b) 1 and 3 only (c) 1,2 and 3 (d) 2 only

Which is correct about Gutta parcha rubber? (1) a very hard material (2) a synthetic polymer (3) a trans 1,4 -polyisoprene polymer (a) 2 only (b) 3 only (c) 1 and 3 only (d) 1,2 and 3

Which of the following statements about polymers is correct? (1) The ratio of the weight average and number average molecular masses, \(\bar{M}_{\text {. }} / \bar{M}_{n}\), is called poly dispersion index (P.D.I.) (2) The number average molecular mass, \(\overline{\mathrm{M}} \mathrm{n}\) and the weight average molecular mass \(\bar{M}_{w}\) are expressed by the equations \(\overline{\mathrm{M}}_{\mathrm{w}}=\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}\) and \(\overline{\mathrm{M}}_{\mathrm{w}}=\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}^{2}}{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}\) Here, \(\mathrm{N}_{i}\) is the number of molecules of molecular mass \(\mathrm{M}_{i}\) of the species \(\mathrm{i}\). (3) Some physical properties such as freezing point, vapour pressure and osmotic pressure are related directly to \(\mathrm{M}\) whereas some other physical properties like light scattering, sedimentation and diffusion constant are related directly to \(\mathrm{M}_{w}\). (a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1,2 and 3

What is the order of decreasing reactivity of the following monomers towards anionic polymerization? (1) \(\mathrm{CH}_{2}=\mathrm{CHCN}\) (2) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}\) (3) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}=\mathrm{CH}_{2}\) (a) \(1>2>3\) (b) \(3>2>1\) (c) \(2>3>1\) (d) \(3>1>2\)

A sample of a polymer has 200 molecules of molarmass 1000 each, 300 molecules of molarmass 10,000 each and 500 molecules of molarmass 1,00000 . The weight average molecular mass of this polymer is? (a) 55394 (b) 49553 (c) 94553 (d) 35594

Poly ethylene glycol is farmed as a result of? (a) free radical polymerisation of epoxider (b) cationic polymerisation of epoxider (c) anionic polymerisation of epoxider (d) Can be any of these

Which is/are correct about kevlar here? (I) It is a polyamide (II) It is used in making buluet proof vests etc III) It is homopolymer formed by addition reaction. IV) It is polymer of terephthalic acid and 1,4 diamino benzene. (a) I, II, III (b) I, II, IV (c) II, III, IV (d) I, II, III, IV

Which is/are correct about spandex? (I) It is a poly urethane (II) It is a flexible polymer (III) It is a polymer of toluene 2,6 di isocyanate and glycol (IV) It is a polymer of ammonum carbamate (a) I, II, III (b) I, II, IV (c) II, II, IV (d) I, II, III, IV

Which of these polymers involve cross linkages? (I) Bakelite (II) Polythene (III) Melmac (IV) Vulcanized rubber (a) I, III, IV (b) II only (c) III, IV (d) I,IV

Which are true about polymers? (a) They all have a repeating structural unit. (b) They have high viscosity (c) They scatter light. (d) They have low molecular weights.

Which of the following compounds contain amide linkage? (a) Acetamide (b) Nylon-6 (c) Cellulose (d) Proteins

Nylon-6 is (a) A step growth polymer (b) A copolymer (c) An addition polymer (d) A condensation polymer

Which of the following are biopolymers? (a) Leather (b) Nucleic acids (c) Orlon (d) Bakelite

Which of the following is a condensation polymer? (a) Polyacrylonitrile (b) Bakelite (c) Glyptal (d) Nylon \(-6,6\)

Polymerisation is the process by which monomers are converted into polymers. Both polymers and macromolecules are high molecular mass substances but still they have one important difference. For example, polythene and chlorophyll are macro molecules but polythene alone is a polymer because it has a repeating structural unit. Polymers are classified on the basis of structure, synthesis and molecular force existing between the polymer molecules. Which of the following cannot be used as a plasticizer? (a) (b) (c) Tricresyl phosphate (d) Di- \(\mathrm{n}-\) octyl phthalate

Polymerisation is the process by which monomers are converted into polymers. Both polymers and macromolecules are high molecular mass substances but still they have one important difference. For example, polythene and chlorophyll are macro molecules but polythene alone is a polymer because it has a repeating structural unit. Polymers are classified on the basis of structure, synthesis and molecular force existing between the polymer molecules. Identify the incorrect statement: (a) Kelvar is a nylon - polymer obtained by condensation of terephthalic acid and 1,4 - diamino benzene (b) Lexan is a nylon \(-\) polymer prepared by condensation of acrylic acid and vinyl cyanide. (c) Nomex is used in fire resistant protective clothing. (d) Vinyon is a co- polymer of vinyl chloride and vinyl acetate.

Polymer is a very large molecule that is made up of repeating small molecular units called monomers. The chemical reaction that unites the monomers is called polymerization.There are homopolymers, copolymers depending upon the type of monomers present in them. Following is the example of \(\mathrm{nA}+\mathrm{nB} \rightarrow-\mathrm{B}-\mathrm{B}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{A}-\mathrm{B}-\mathrm{B}\) \(-\mathrm{B}-\mathrm{B}-\mathrm{B}-\mathrm{B}-\mathrm{A}-\mathrm{A}-\) (a) Alternate copolymer (b) Block copolymer (c) Graft copolymer (d) Random copolymer

Polymer is a very large molecule that is made up of repeating small molecular units called monomers. The chemical reaction that unites the monomers is called polymerization.There are homopolymers, copolymers depending upon the type of monomers present in them. Which of the following monomers will give radical polymerization most readily? (a) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}=\mathrm{CH}_{2}\) (b) \(\mathrm{CH}_{2}=\mathrm{CH}_{2}\) (c) \(\mathrm{CH}_{3}-\mathrm{C}\left(\mathrm{CH}_{3}\right)=\mathrm{CH}_{2}\) (d) \(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}_{2}\)

Match the following $$ \begin{array}{ll} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { (a) Starch } & \text { (p) Polymer of amino acid } \\ \text { (b) Nylon - } 6 & \text { (q) Polymer of } \alpha-D-\text { Glucose } \\\ \text { (c) Protein } & \text { (r) Polyamide } \\ \text { (d) Natural rubber } & \text { (s) Isoprene } \\ & \text { (t) Caprolactum } \\ \hline \end{array} $$

Match the following $$ \begin{array}{ll} \text { Column-I } & \text { Column-II } \\ \hline \text { (a) Nylon } 6,10 & \text { (p) Polyster } \\ \text { (b) Glyptal } & \text { (q) Polyamide } \\ \text { (c) Teflon } & \text { (r) Condensation polymer } \\ \text { (d) Bakelite } & \text { (s) Addition polymer } \\ & \text { (t) Novolac is obtained before } \\ \text { the final polymer } \end{array} $$

Match the following $$ \begin{array}{ll} \hline \text { Column-I } & \text { Column-II } \\ \hline \text { (a) Nylon 6, } 6 & \text { (p) Polyester } \\ \text { (b) Dacron } & \text { (q) Polyamide } \\ \text { (c) Teflon } & \text { (r) Condensation polymer } \\ \text { (d) Bakelite } & \text { (s) Addition polymer } \\ & \text { (t) } \mathrm{C}_{2} \mathrm{~F}_{4} \\ \hline \end{array} $$

Match the following Column-I Column-II (a) Cellulose (p) synthetic polymer (b) Nylon 6 (q) amide linkage (c) Silk (r) \(3 \mathrm{D}\) - Network structure (d) Bakelite (s) glycosidic linkage (t) biopolymer