Organic Chemistry C. Polymer

31. Teflon is the common name of – [Uttarakhand P.C.S. (Pre) 2016]

(a) Polytetrafluoroethylene
(b) Polyvinyl chloride
(c) Polyvinyl fluoride
(d) Dichlorodifluoromethane

Correct Answer: (a) Polytetrafluoroethylene

Solution:Polytetrafluoroethylene, commonly known as Teflon, is a polymer of tetrafluoroethylene.

32. Which among the following is not a polymer? [Uttarakhand P.C.S. (Pre) 2012]

(a) Nylon
(b) Teflon
(c) Caprolactam
(d) Polystyrene

Correct Answer: (c) Caprolactam

Solution:The polymer is a long chain molecule made up of many small identical units. Polymers are common in nature. Wood, rubber, cotton, silk, proteins, enzymes, and cellulose are all examples of polymers. A wide variety of synthetic polymers has been produced largely from petroleum-based raw materials. These include polyurethane, Teflon, polyethylene, polystyrene, and nylon. Caprolactam (CPL) is an organic compound with the formula (CH₂)₅C(O)NH. Caprolactam is the monomer used to produce Nylon 6. It is a cyclic amide, not a polymer itself.

33. Which one of the following substances is NOT synthetic? [U.P.P.C.S. (Pre) 2020]

(a) Fibroin
(b) Lexan
(c) Neoprene
(d) Teflon

Correct Answer: (a) Fibroin

Solution:

Fibroin is a natural substance and not synthetic. Fibroin is an insoluble protein present in silk produced by numerous insects, such as the larvae of Bombyx mori, and other moth genera. Silk in its raw state consists of two main proteins, sericin and fibroin.

Lexan: A brand name for polycarbonate, which is a synthetic polymer.

Neoprene: A synthetic rubber (polychloroprene).

Teflon: A synthetic polymer (polytetrafluoroethylene).

34. Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics? [I.A.S. (Pre) 2021]

(a) Low-density polyethylene
(b) Polycarbonate
(c) Polyethylene terephthalate
(d) Polyvinyl chloride

Correct Answer: (b) Polycarbonate

Solution:Bisphenol A (BPA) is a chemical produced in large quantities for use primarily in the production of polycarbonate plastics. It is found in various products, including shatterproof windows, food packaging materials, eyewear, water bottles, and epoxy resins that coat some metal food cans, bottle tops, and water supply pipes. BPA has been used in food packaging.

35. What is Bisphenol A (BPA)? [I.A.S. (Pre) 2008]

(a) A medical test for detecting cancer.
(b) A test for testing the use of drugs to improve performance by athletes.
(c) A chemical used for the development of food-packaging materials.
(d) A special type of alloy steel.

Correct Answer: (c) A chemical used for the development of food-packaging materials.

Solution:Bisphenol A (BPA) is a chemical produced in large quantities for use primarily in the production of polycarbonate plastics. It is found in various products, including shatterproof windows, food packaging materials, eyewear, water bottles, and epoxy resins that coat some metal food cans, bottle tops, and water supply pipes. BPA has been used in food packaging. It has been a subject of concern due to potential health effects.

36. Phenol is used in the manufacture of which one of the following? [U.P.P.C.S. (Mains) 2010]

(a) P.V.C.
(b) Nylon
(c) Polystyrene
(d) Bakelite

Correct Answer: (d) Bakelite

Solution:Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. It was developed by the Belgian-American chemist Leo Baekeland in 1907.

37. Bakelite is formed by the condensation of: [60th to 62nd B.P.S.C. (Pre) 2016]

(a) Urea and formaldehyde
(b) Phenol and formaldehyde
(c) Phenol and acetaldehyde
(d) Melamine and formaldehyde
(e) None of the above/More than one of the above

Correct Answer: (b) Phenol and formaldehyde