Match List I with List II

	List-I Polymers		List-II Commenrcial names
A	Phenol-formaldehyde resin	I	Glyptal
B	Copolymer of $1,3$-butadiene and styrene	II	Novolac
C	Polyester of glycol and phthalic acid	III	Buna-$\mathrm{s}$
D	Polyester of glycol and terephthalic acid	IV	Dacron

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Novolacs are phenol-formaldehyde resins with a formaldehyde to phenol molar ratio of less than one.

The rubber obtained is also called Styrene butadiene rubber (SBR). In Buna-S, Bu stands for butadiene and, Na for sodium and S for styrene. It is vulcanised with sulfur. The rubber is slightly inferior to natural rubber in its physical properties.

Glyptal- a polyester is formed by ethylene glycol and phthalic acid by step-growth polymerization.

Dacron obtained by condensation polymerisation of ethylene glycol and terephthalic acid at $420-460 \mathrm{K}$ using zinc acetate and antimony oxide as catalyst.