Write down the preparation and use of Buna-$N$.

Name the accelerator used to introduce a network of crosslinks in elastomers.

Which of the following statements is incorrect about $Novolac$?

Among the following,the correct statement$(s)$ about polymers is(are):
$A$. The polymerization of chloroprene gives natural rubber.
$B$. Teflon is prepared from tetrafluoroethene by heating it with persulphate catalyst at high pressures.
$C$. $PVC$ are thermoplastic polymers.
$D$. Ethene at $350-570 \ K$ temperature and $1000-2000 \ atm$ pressure in the presence of a peroxide initiator yields high density polythene.

Neoprene is the polymer of a monomer $X$. The $IUPAC$ name of $X$ is

In elastomers,the intermolecular forces are......