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a
PVC
b
Buna-N
c
Neoprene
d
Nylon-6,6
answer is D.
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Detailed Solution
Buna-N, Neoprene…..Elastomers….weak vanderwaals forces;Nylon-6,6…..Fibre…..Polyamide….strong hydrogen bonds;PVC….Thermoplastic….attractive forces are stronger than in elastomers and weaker than in fibres;