JEE Advanced 2022 · Paper 2 · Chemistry Q14

ChemistryMultiple correct+4 / -2Question 50 of 54

Among the following, the correct statement(s) about polymers is(are)

The polymerization of chloroprene gives natural rubber.

Teflon is prepared from tetrafluoroethene by heating it with persulphate catalyst at high pressures.

PVC are thermoplastic polymers.

Ethene at 350-570 K temperature and 1000-2000 atm pressure in the presence of a peroxide initiator yields high density polythene.

Answer and worked solution

Official answer: B, C

Check each option.

(A) Polymerising chloroprene gives neoprene, a synthetic rubber. Natural rubber is cis-polyisoprene. False.
(B) Teflon is made by heating tetrafluoroethene with a persulphate catalyst at high pressure. True.
(C) PVC is a thermoplastic. True.
(D) Ethene at 350-570 K and 1000-2000 atm with a peroxide initiator gives low-density polythene. High-density polythene needs a Ziegler-Natta catalyst. False.

(B), (C).

JEE Advanced 2022 · Paper 2, Chemistry question 14