The monomer used to produce orlon is

Match the polymers in column $- A$ with their main uses in column $- B$ and choose the correct answer.

Column $- A$	Column $- B$
$(A)$ Polystyrene	$(i)$ Paints and lacquers
$(B)$ Glyptal	$(ii)$ Rain coats
$(C)$ Polyvinyl chloride	$(iii)$ Manufacture of toys
$(D)$ Bakelite	$(iv)$ Computer discs

Write down the preparation,properties and uses of Polytetrafluoroethene (Teflon).

Which of the following compounds are used to obtain $Terylene$ polymer?

The polydispersity index of a polymer containing $10$ molecules with molecular mass $1.0 \times 10^4$ and $10$ molecules with molecular mass $1.0 \times 10^5$ is approximately.

The number average molecular mass $(M_n)$ and weight average molecular mass $(M_w)$ of a polymer are $30000$ and $40000$ respectively. The polydispersity index $(PDI)$ of the polymer is: