(i) What is the role of t-butyl peroxide in the polymerization of ethene? (ii) Identify the monomers in the following polymer : $+ \mathrm{NH} - (\mathrm{CH}_2)_6 - \mathrm{NH} - \mathrm{CO} - (\mathrm{CH}_2)_4$ $- \mathrm{CO}^{+}_{n}$ (iii) Arrange the following polymers in the increasing order of their intermolecular forces: Polystyrene, Terylene and Buna-S OR Write the mechanism of free radical polymerization of ethene.