Write the structures of monomers used for getting the following polymers:
(a) Novolac
(b) Neoprene
(c) Buna-S
OR
(a) Write one example each of:
(i) Cross- linked polymer
(ii) Natural polymer
(b) Arrange the following in the increasing order of their intermolecular forces: Terylene, Buna-N, Polystyrene
(c) Define biodegradable polymers with an example.