A) neoprene
B) terylene
C) polystyrene
D) bakelite
Correct Answer: A
Solution :
(i) Elastomers are the polymers in which the intermolecular forces of attraction between the polymer chains are the weakest (van der Waals forces of attraction),\[eg,\] neoprene. (ii) Fibres are the polymers in which the intermolecular forces of attraction are the strongest (H-bonding or dipole-dipole interactions). \[eg,\] terylene. (iii) Thermoplastics are the polymers in which intermolecular forces of attraction are in between those of elastomers and fibres, \[eg,\] polystyrene. (iv) Thermosetting polymers are the semi-fluid substances with low molecular masses which when heated in a mould, undergo a permanent change in chemical composition to give a hard, infusible and insoluble mass. \[eg,\] bakelite.
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