Which of the following is a fluorine-containing compound?

If $\bar{M}_w$ is the weight average molecular weight and $\bar{M}_n$ is the number average molecular weight of a polymer,the poly dispersity index $(PDI)$ of the polymer is given by

Match the polymers given in column $-I$ with their main applications given in column $-II$.

Column $-I$	Column $-II$
$A$. Bakelite	$i$. Unbreakable crockery
$B$. Low density polythene	$ii$. Non-stick cookwares
$C$. Melamine-formaldehyde resin	$iii$. Packaging material for shock
$D$. Nylon $-6$	$iv$. Electrical switches
$E$. Polytetrafluoroethene	$v$. Squeeze bottles
$F$. Polystyrene	$vi$. Tyre cords

Arrange the following polymers in increasing order of their intermolecular forces.
$(i)$ Nylon $6,6$,Buna$-S$,Polythene.
$(ii)$ Nylon $6$,Neoprene,Polyvinyl chloride.

The polymer $\begin{array}{*{20}{c}} {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,CH_3\,\,\,\,\,\,\,\,\,\,\,\,\,CH_3} \\ {\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ {{( - CH_2 - C - CH_2 - C - )}_n} \\ {\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,CH_3\,\,\,\,\,\,\,\,\,\,\,\,\,CH_3} \\ \end{array}$ is formed from which monomer unit?

Which one of the following is used in the preparation of cellulose nitrate?