Choose the correct option(s) from the following

A

Natural rubber is polyisoprene containing trans alkene units

B

Nylon-6 has amide linkages

C

Teflon is prepared by heating tetrafluoroethene in presence of a persulphate catalyst at high pressure

D

Cellulose has only $$\alpha$$-D-glucose units that are joined by glycosidic linkages