A) polyamide
B) polyester
C) polystyrene
D) polyvinyl
Correct Answer: A
Solution :
\[n\,\underset{adipic\,acid}{\mathop{HO-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-}}\,{{(C{{H}_{2}})}_{4}}-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-OH\] \[\underset{hexamethylene\text{ }diamine}{\mathop{+n{{H}_{2}}N-{{(C{{H}_{2}})}_{6}}-N{{H}_{2}}}}\,\xrightarrow{{}}\] \[\underset{nylon\text{ }66}{\mathop{\left[ --\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-{{(C{{H}_{2}})}_{4}}-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-NH-{{(C{{H}_{2}})}_{6}}\overset{\begin{smallmatrix} H \\ |\, \end{smallmatrix}}{\mathop{N}}\,-- \right]}}\,\] It is formed by acid and amine, so it is poly amide.
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