Among the following, the correct statement(s) about polymers is(are)
- (A)The polymerization of chloroprene gives natural rubber.
- (B)Teflon is prepared from tetrafluoroethene by heating it with persulphate catalyst at high pressures.✓ Correct
- (C)PVC are thermoplastic polymers.✓ Correct
- (D)Ethene at 350-570 K temperature and 1000-2000 atm pressure in the presence of a peroxide initiator yields high density polythene.
Answer: (B), (C)
Solution
Option (A): Polymerization of chloroprene gives neoprene (synthetic rubber), not natural rubber. Natural rubber is polyisoprene. Incorrect.
Option (B): Teflon (polytetrafluoroethylene) is prepared by polymerizing tetrafluoroethene using persulphate catalyst at high pressure and temperature. Correct.
Option (C): PVC (polyvinyl chloride) is a thermoplastic polymer that softens on heating and hardens on cooling. Correct.
Option (D): Ethene at 350-570 K and 1000-2000 atm with peroxide initiator yields low-density polyethene (LDPE), not high-density polyethene. HDPE is made at lower pressure with Ziegler-Natta catalyst. Incorrect.
Option (B): Teflon (polytetrafluoroethylene) is prepared by polymerizing tetrafluoroethene using persulphate catalyst at high pressure and temperature. Correct.
Option (C): PVC (polyvinyl chloride) is a thermoplastic polymer that softens on heating and hardens on cooling. Correct.
Option (D): Ethene at 350-570 K and 1000-2000 atm with peroxide initiator yields low-density polyethene (LDPE), not high-density polyethene. HDPE is made at lower pressure with Ziegler-Natta catalyst. Incorrect.
JEE Advanced · 2022 · 28 Aug 2022 · Paper 2 · One or more correct options