Choose the correct options(s) from the following: Teflon is prepared by heating tetrafluoroethene in presence of a persulphate catalyst at high pressure; Natural rubber is polyisoprene containing trans alkene units; Nylon-6 has amide linkages; Cellulose has only α-D-glucose units that are joined by glycosidic linkages.

Correct option is C. Nylon-6 has amide linkages.
(1) Teflon is prepared by heating tetrafluoroethene in presence of a persulphate catalyst at high pressure via radical addition mechanism.
(2) Natural rubber is polyisoprene containing cis alkene units.
(3) Nylon-6 has amide linkages. It is fact.
(4) Cellulose is a β-D-glucose linear chain linked with β-(1-4)-glycosidic bonds.
Options A and C are correct.