Which of the following polymers is used in electrophoresis in the form of gel?

Identify the monomers in the following polymeric structures:
$(i)$ $-[CO-(CH_2)_8-CO-NH-(CH_2)_6-NH]-_n$
$(ii)$ Melamine-formaldehyde polymer

Match the polymers in List-$I$ with their monomers in List-$II$ and select the correct match:

List-$I$	List-$II$
$A$. $Nylon$ $6,6$	$i$. $Ethylene$ $glycol$ and $Terephthalic$ $acid$
$B$. $Terylene$	$ii$. $1,3-Butadiene$ and $Styrene$
$C$. $Buna-S$	$iii$. $Chloroprene$
$D$. $Neoprene$	$iv$. $Acrylonitrile$
	$v$. $Adipic$ $acid$ and $Hexamethylenediamine$

The correct match 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.

Identify the polymer used to prepare plastic bottles needed to store cooking oil.

The compound required for the formation of a thermosetting polymer with methanol is