Which of the following polymers is used as a wool substitute?

Choose the correct option$(s)$ from the following:
$(1)$ Natural rubber is polyisoprene containing trans alkene units.
$(2)$ Nylon-$6$ has amide linkages.
$(3)$ Cellulose has only $\alpha-D$-glucose units that are joined by glycosidic linkages.
$(4)$ Teflon is prepared by heating tetrafluoroethene in the presence of a persulphate catalyst at high pressure.

Isoprene is a valuable substance for making

Which of the following is a fully fluorinated polymer?

Orlon fibres are made up of:

The correct match between Item-$I$ and Item-$II$ :

Item-$I$	Item-$II$
$a$. Natural rubber	$I$. $1,3-$butadiene $+$ styrene
$b$. Neoprene	$II$. $1,3-$butadiene $+$ acrylonitrile
$c$. Buna$-N$	$III$. Chloroprene
$d$. Buna$-S$	$IV$. Isoprene