Caprolactam is used for the manufacture of

The monomer of $[-C(CH_3)_2-CH_2-]_n$ is:

Which among the following is an example of a cyclic amide?

Which plastic is obtained from $CHCl_3$ as follows:
$CHCl_3$ $\xrightarrow[SbF_3]{HF} X$ $\xrightarrow{800^{\circ}C} Y$ $\xrightarrow{\text{Polymerisation}} \text{Plastic}$

Orlon is a polymer of

The polymer formed by condensation polymerization is .....