Write the structures of monomers used for getting the following polymers:
(i) Nylon-6,6
(ii) Glyptal
(iii) Buna-S

OR

(i) Is  a homopolymer or copolymer? Give reason.
(ii) Write the monomers of the following polymer:

(iii) What is the role of Sulphur in vulcanization of rubber?

(i) Nylon-6, 6: Hexamethylenediamine

(ii) Glyptal:

(iii) Buna-S

OR

(i) This is a homopolymer formed by a propene monomer because in this polymerization only one monomer is being used without losing any molecule.

(ii)

(iii) In vulcanization, Sulphur forms cross links at the reactive sites of double bonds of natural rubber so the rubber gets stiffened.