Why is cationic polymerization preferred in case of vinylic monomers containing electron donating groups?

Differentiate between elastomers and fibres on the basis of inter-molecular forces. Give one structural formula of each type of polymers.

What are the different ways of initiating addition polymerization? Describe one of them for polymerising vinyl chloride.

How are polymers classified into different categories on the basis of intermolecular forces? Give one example of a polymer of each of these categories.

Depict a free radical mode of addition polymerization of isoprene.

What is the difference thermo – plastic polymers and thermosetting polymers? 

Will you prefer to polymerize acrylo-nitrile under anionic or cationic polymerization conditions? Explain your choice.

Differentiate between chain growth and step growth polymerization. Give the structural formula one polymer of each type.

What are elastomers? Write the chemical equation to represent the preparation of Buna-S.