Polymer Technology
Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is

Chloroethane
Isoprene
None of these
Chlorophrene

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Polymer Technology
Pickout the wrong statement.

The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres
Polymers made of only one monomer is called homopolymer
Vulcanised rubber is more elastic than natural rubber
Polymers made of more than one monomer is called copolymer or mixed polymer

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