The process of heat-softening,moulding and cooling to rigidness can be repeated for which plastics?

Identify the thermoplastic polymer from the following.

Which one is a polymer compound?

Write the names of monomers of the following polymers:
$(i)$ $-(NH-(CH_2)_6-NH-CO-(CH_2)_4-CO)_n-$
$(ii)$ $-(CO-(CH_2)_5-NH)_n-$
$(iii)$ $-(CF_2-CF_2)_n-$

$A$ polymer contains $50$ molecules with molecular mass $5,000$, $100$ molecules with molecular mass $10,000$ and $50$ molecules with molecular mass $15,000$. Calculate the number average molecular mass. (in $,000$)

Natural rubber is a polymer of......