How many of the following polymers contain atoms of halogen family in their structures ?

$PVC$, orlon, teflon, terylene, neoprene, bakelite

How many of the following are thermoplastic polymers ?

Melamine, bakelite, polystyrene, polyvinyl chloride, teflon, polythene

${\mathrm{CaC}}_2+2{\mathrm{H}}_2\mathrm{O} \to \mathrm{Ca}(\mathrm{OH}{)}_2+\mathrm{CH}\equiv \mathrm{CH}$

$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_2+{\mathrm{H}}_2\stackrel{\mathrm{Pd}-{\mathrm{BaSO}}_4}{\to } {\mathrm{CH}}_2={\mathrm{CH}}_2 \\ \mathrm{n} {\mathrm{CH}}_2={\mathrm{CH}}_2\stackrel{}{\to }{\sout{(}{\mathrm{CH}}_2-{\mathrm{CH}}_2\sout{)}}_{\mathrm{n}}\text{(polyethylene)} \end{gathered}$$

What is the amount of polyethylene formed from $20 \mathrm{Kg}$ of calcium carbide from the above reactions?

A polymer $\mathrm{X}$ is used in the controlled release of drugs. On hydrolysis of $\mathrm{X}$, we get $\mathrm{Y}$ and $\mathrm{Z}$, which on reaction with ${\mathrm{LiAlH}}_4$ gives: 

a 

b 

c