Melamine is

In which of the following pairs is the polymer correctly matched with the intermolecular forces present in them?

$A$. Neoprene --- Weak intermolecular forces	$B$. Terylene --- Hydrogen bonding
$C$. Polystyrene --- Very weak intermolecular forces	$D$. Polythene --- Hydrogen bonding

Orlon is a polymer of:

Polythene is

The number average molecular mass of a polymer that contains $15$ molecules with each of mass $8,000$ and $15$ molecules with each of mass $80,000$ is: (in $,000$)

$A$ 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.