(i) Terylene:
The monomers of Terylene are terephthalic acid and ethylene glycol.
Terephthalic acid:
HOOC-C6H4-COOH
Ethylene glycol:
HO-CH2-CH2-OH
(ii) Buna-S:
The monomers of Buna-S are 1,3-butadiene and styrene.
1,3-butadiene:
CH2=CH-CH=CH2
Styrene:
C6H5-CH=CH2
(iii) Neoprene:
The monomer of Neoprene is chloroprene (2-chloro-1,3-butadiene).
Chloroprene:
CH2=CCl-CH=CH2