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 \( 350{-}570 \, \mathrm{K} \) temperature and \( 1000{-}2000 \, \mathrm{atm} \) pressure in the presence of a peroxide initiator yields high density polythene.
