Bakelite is a cross-linked polymer of formaldehyde and :

Match the following polymers in List-$I$ with their monomers in List-$II$:

List-$I$	List-$II$
$(A)$ $-(NH-(CH_2)_6-NH-CO-(CH_2)_4-CO)_n-$	$(I)$ Ethylene glycol and terephthalic acid
$(B)$ $-(CO-(CH_2)_5-NH)_n-$	$(II)$ Phenol and formaldehyde
$(C)$ $-(CF_2-CF_2)_n-$	$(III)$ Caprolactam
$(D)$ $-(O-CH_2-CH_2-OOC-C_6H_4-CO)_n-$	$(IV)$ Hexamethylene diamine and adipic acid
	$(V)$ Tetrafluoroethene

Identify the correct statement from the following:
$(A)$ Glyptal is made from the monomers ethylene glycol and phthalic acid
$(B)$ Bakelite is used in making electrical switches
$(C)$ Nylon-$2$-nylon-$6$ is a biodegradable polymer

Teflon is a polymer of which monomer,or how is Teflon obtained by the polymerisation of which compound?

Which one of the statements regarding $X$ is not correct?
$3$-Hydroxybutanoic acid + $3$-Hydroxypentanoic acid $\longrightarrow X$

Which of the following is used in the vulcanization of rubber?