Which of the following is not an example of a natural polymer?

Which of the following is not an example of a condensation polymer?

$A$ condensation polymer among the following polymers is

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

Amongst the following, how many of them come under the category of elastomers?
Natural rubber, polyethene, vulcanized rubber, bakelite, polyvinylchloride, Buna-$N$, Nylon $6$, Neoprene

Which of the following has the largest molecular mass?