Synthetic polymer bakelite can be prepared from the following compounds:

Which of the following polymers does not contain an $N$ atom?

The monomer of Teflon is :-

$A$ natural linear polymer of $2-$methyl$-1,3-$butadiene becomes hard on treatment with sulphur between $373 \ K$ to $415 \ K$ and $-S-S-$ bonds are formed between chains. Write the structure of the product of this treatment.

Which one of the following structures represents the neoprene rubber?

$A$ polymer with high chemical stability has a melting point $(M.P.)$ of $327\ ^\circ C$ and the density of a completely crystalline sample is $2.3\ g/cm^3$. It is: