Write the structures of monomers used for getting the following polymers: (a) Nylon-6,6 (b) Bakelite (c) Buna -S OR (a) Write one example each of (i) Thermoplastic polymer (ii) Elastomers (b) Arrange the following polymers in the increasing order of their intermolecular forces: Polythene, Nylon-6,6, Buna-S (c) Which factor provides crystalline nature to a polymer like Nylon?