Give reason for:

a$-$ using ammonium persulphate in suspension and emulsion polymerization.

b$-$ Polymers do not have a boiling point.

c$-$ Vulcanization is used in rubber industry.

d$-$ Bulk polymerization and solution polymerization have limited applications.

e$-$ The addition of soap in emulsion polymerization.

f$-$ The addition of gelatins in suspension polymerization.

g$-$ Most polymers are polydisperse.

h$-$ Fibers and rigid plastics have high modulus and low extensibility

i$-$ Rubbers have high extensibility

j$-$ Polyethylene is a crystalline polymer

k$-$ Complete crystalline polymers do not have Tg

l$-$ Complete amorphous polymers do not have Tm

m$-$ Hardness of ebonite

n$-$ Intrinsic viscosity is used to determine Mw of polymers

o$-$ Hydrogels are important polymer class

p$-$ Polystyrene dissolves in toluene and not in water$4$