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- $s$

D Polyester of glycol and terephthalic acid IV Dacron

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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- $s$
D	Polyester of glycol and terephthalic acid	IV	Dacron

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Match List I with List II List-I Polymers List-II Commenrcial names A Phenol-formaldehyde resin I Glyptal B Copolymer

Quantrex Academy · Accepted Answer

Correct answer: B. A - II, B - III, C - I, D - IV

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 $420 - 460K$ using zinc acetate and antimony oxide as catalyst.

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