Which of the following polymers has the strongest intermolecular forces of attraction?

Teflon,styron (polystyrene),and neoprene are all:

$Buna-S$ is an example of:

$A$ 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 $,000$)

The schematic illustrations of macromolecules given below represent:

Nylon-$66$ is not a .......