Which of the following polymers are synthesized using a free radical polymerization technique?

Among $\mathrm{i}-\mathrm{iv}:$

The compound that does not undergo polymerization under radical initiation is:

Thermosetting polymers:

(a) are formed by condensation reaction.

(b) have cross-linked structure.

(c) are hard, rigid and brittle.

Correct statements are.

Which of the following properties are associated with thermoplastics? 

(a) Linear polymers

(b) Highly cross-linked

(c) Slightly branched long chain molecules 

(d) Molded easily by heating