Explanation

(a)
(i) Addition polymers are those in which monomer units combine without loss of small molecules. Rubber,polyvinyl chloride and polyethylene are addition polymers.
(ii) Condensation polymers are those in which monomer units condense to form large units along with loss of small molecules like H_{2}O, NH_{3}.-
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is amide linkage, formed by
condensation of $–COOH$ group with $- NH_{2}$ group. It is accompanied by loss of water. So, it is condensation polymer.