The monomer which is present in both bakelite and melamine polymers is

Match the following.

List-I (Monomer/s)	List-II (Name of polymer)
A. CF₂$=$CF₂	I. Neoprene
B. NH₂(CH₂)₆NH₂, HO₂C(CH₂)₄CO₂H	II. Bakelite
C. C₆H₅OH₃ HCHO	III. Teflon
D. CH₂$=$CH(Cl)—CH$=$CH₂	IV. Nylon 6,6

The correct answer is

$$ \text { Match the following } $$

List-I (Polymer)		List-II (Monomers)
(A)	Bakelite	(I)	$$ \text { 2-methvl-1, 3-butadiene } $$
(B)	Natural rubber	(II)	$$ \text { Glvcine + aminocaproic acid } $$
(C)	Glyptal	(III)	$$ \text { Phenol + formaldehyde } $$
(D)	Nylon 2-nylon 6	(IV)	$$ \text { Phthalic acid + ethylene glycol } $$

Amongst the following, how many of them come under the category of elastomers? Natural rubber, polyethene, vulcanized rubber, bakelite, polyvinylchloride, buna-N, nylon-6, neoprene