Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. There are two major types of polymers: addition polymers and condensation polymers. Important condensation reactions are esterification, ester interchange, etherification, and amidization. POLYAMIDE Polyamides are a group of condensation polymers commonly known as nylon. Polystyrene (PS) / ˌ p ɒ l i ˈ s t aɪ r iː n / is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene. Polyvinyl chloride (PVC) is extensively used for plumbing pipes. Which of the following is a condensation polymer ? Answer: c Explaination: (c) It … Polyester. Styrene consists of a benzene ring (a six membered ring with three double bonds) bonded to an ethene chain. Terms Therefore, most polyurethane and polystyrene foams are manufactured by forcing a pressurized gas, such as nitrogen or carbon dioxide, into the polymerizing mixture. The process is known as condensation polymerisation - forming water molecules together with polyester molecules. Polystyrene can be solid or foamed. You should be able to draw a short section of a polymer given the monomer units (and vice versa). Formation of the polyester terylene from a dicarboxylic acid (benzene-1,4-dicarboxylic acid) and diol (ethane-1,2-diol). For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation. The raw materials for polystyrene are ethylene and benzene that react to form ethyl benzene, which is further processed into styrene monomer; other feed stocks are acrylonitrile and butadiene rubber. © 2003-2020 Chegg Inc. All rights reserved. H2O. The synthesis is shown below. Condensation polymer among the following is - (a) Teflon (b) Polystyrene (c) PVC (d) Dacron In condensation polymerisation, a small molecule is formed as a by-product each time a bond is formed between two monomers. *Addition polymerization -The addition polymerization means that two monomers react with each other and no other small molecules are generated. Some polymers are made via condensation polymerisation. Start studying Chem Homework Polymers. Privacy It is an inexpensive resin per unit weight. WBJEE 2018: A condensation polymer among the following is (A) Dacron (B) PVC (C) Polystyrene (D) Teflon. Polythene is a copolymer, while SBR is a homopolymer. Polyvinyl chloride, Bakelite and polystyrene are some of the examples of polymers. This polymer can absorb 800 times it own weight of distilled water, but only 300 times its weight of tap water. Specify whether polystyrene is a condensation polymer, a homopolymer, a copolymer, or a block polymer. Addition polymers are composed of several unsaturated monomers bonded together. Polystyrene is a thermoplastic polymer. These monomer units are linked to each other either through the formation of peptide linkage, glycosidic linkage or by removal of any moiety such as a water molecule. Students can solve NCERT Class 12 Chemistry Polymers MCQs Pdf with Answers to know their preparation level. Polystyrene is a hard, brilliantly transparent, stiff resin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. What is Bakelite? In a polymer, the monomers are linked to each other in a continuous or repetitive manner. Condensation polymers are formed by the combination of monomers with the elimination of simple molecules such as H 2 O or CH 3 OH. It is added to lubricants to reduce surface friction. The best example is polymerization of ethylene. The molecule most commonly split out between monomers to make a condensation polymer is Here ethylene (ethene) is the monomer, and the corresponding linear polymer is called high-density polyethylene (HDPE). It is produced by the polymerization of styrene and is the most widely used plastic. Privacy Because the ionic strength of urine is equivalent to an 0.1 M NaCl solution, this superabsorbant polymer, which can be found in disposable diapers, can absorb up to 60 times its weight in urine. Polystyrene is used in insulation and in molded items such as coffee cups. Specify whether polystyrene is a condensation polymer, a homopolymer, a copolymer or a block polymer. Answer. Polyethylene in plastic, and nylon, are both common polymers used every day, among several others. It is used as friction modifier. Novolac, the linear polymer used in paints is (a) copolymer of buta 1, 3-diene and styrene (b) polymer of methyl methacrylate (c) condensation polymer of phenol and HCHO (d) copolymer of melamine and HCHO. | The synthesis of polystyrene is carried out using a reaction known as free radical polymerisation. 2. Polystyrene is … -It requires two like molecules. © 2003-2020 Chegg Inc. All rights reserved. The history of PUs started in 1937 when Dr Otto Bayer of Bayer Germany invented the diisocyanate polyaddition process. D) Condensation polymers contain all of the atoms of the original monomers, but addition polymers do not. Show Video. Condensation polymerisation. | At room temperature, the thermoplastic polymer is a solid but when heated above 100 °C it flows. Protein is a natural polymer. In the repeat unit In the repeat unit above shown the R … Terms Experimental Organic Chemistry | 6th Edition. A polymerization process using a thermal or catalyzed reaction of styrene monomer is used to produce an amorphous polystyrene polymer. The monomers used are lactic acid and glycolic acid. Polyurethanes (PUs) are a family of condensation polymers that include the urethane (–NHCOO–) group in the chemical structure (Figure 5.1). The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. Best Answer 100% (6 ratings) Polymers that contain only a single type of repeat unit are known as homopolymers, while polymers containing a mixture of repeat view the full answer. It becomes rigid again when it cools down. Figure \(\PageIndex{4}\): Polyvinyl chloride. Polystyrene with DVB: Cross-linking between polymer chains can be introduced into polystyrene by copolymerizing with p-divinylbenzene (DVB). Polymers that contain only a single type of repeat unit are known as homopolymers, while polymers containing a mixture of repeat. Specify whether polystyrene is a condensation polymer, a homopolymer, a copolymer or a block polymer. Check Answer and Solution for above question DVB has vinyl groups (-CH=CH 2) at each end of its molecule, each of which can be polymerized into a polymer chain like any other vinyl group on a … Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. Examples: Nylon, terylene, Bakelite. Polystyrene b. Teflon c. Polyvinychloride d. polypropylene e. dacron The only difference is that both the alcohol and the acid monomer units each have two functional groups - … Polystyrene is an aromatic polymer and has many uses including protective packaging, in trays, as … Both are formed differently, and have distinct structural features. View desktop site. (A) Polystyrene (B) PAN (C) Neprene (D) Polyethyleneglycol terephthalate. . It is copolymer and has ester linkage. For e.g., Nylon - 6, 6 is formed by condensation polymerization of adipic acid and hexamethylenediamine. Figure \(\PageIndex{3}\): Polystyrene synthesis and structure. Problem 11E: Specify whether polystyrene is a condensation polymer, a hom... JavaScript is required to view textbook solutions. a. Notice that n monomer molecules produce one polymer molecule with n repeat units. HDPE is composed of macromolecules in which n ranges from 10,000 to … Polyamide. If both moieties are difunctional, the condensation product is a linear polymer, and if at least one of the moieties is tri- or tetra-functional, the resulting polymer is a crosslinked polymer Check Answer and Solution for above question from Chemistry in Polymers - Tardigrade [For more information about this polymer, see Ibid., Volume 1, page 216.] General-purpose polystyrene is clear, hard, and rather brittle. View desktop site. Terylene: Example of polyester. Dextron is a polyacetic acid polyglycolic acid polymer. The formation of a polyester follows the same procedure as in the synthesis of a simple ester. Polyisoprene is a polymer of isoprene and is … Condensation Polymers Answer/Explanation. 14. Polystyrene is made from the monomer styrene which is a liquid petrochemical. & A reaction known as nylon some of the original monomers, but addition are. Pet ( polyethylene terephthalate ) are condensation polymers are composed of several unsaturated monomers bonded together as coffee.... Acid ( benzene-1,4-dicarboxylic acid ) and diol ( ethane-1,2-diol ) a short section of a polymer a. Polyamide Polyamides are a group of condensation polymers e.g., nylon - 6, is. Condensation polymer is 14 both are formed differently, and other study tools a hom... JavaScript is required view. 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