A) \[-\left[ N{{H}_{2}}-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-{{(C{{H}_{2}})}_{5}} \right]{{-}_{n}}\]
B) Rubber
C) Polyvinyl chloride
D) Polyethylene
Correct Answer: A
Solution :
(i) Addition polymers are those in which monomer units combine without loss of small molecules. Rubber, polyvinyl chloride and polyethelene are addition polymers. (ii) Condensation polymers are those in which monomer units condense to form large units along with loss of small molecules like\[{{H}_{2}}O,\] \[N{{H}_{3}}\]. \[\left[ -HN-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-{{(C{{H}_{2}})}_{5}} \right]\]is amide linkage, formed by condensation of\[-COOH\]group with\[-N{{H}_{2}}\]group. It is accompanied by loss of water. So, it is condensation polymer.
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