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

Isoprene
Chlorophrene
None of these
Chloroethane

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Polymer Technology
Polyvinyl chloride (PVC)

Softening temperature is 200°C
Is produced by polycondensation reaction
Uses either emulsion or suspension polymerisation methods
Can be made thermosetting by adding a plasticiser

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