question_answer

Which of the following is not a synthetic fibre?

A)  Rubber                               

B)  Nylon-6

C)  Nylon-6, 6         

D)  Nylon-6, 10

Correct Answer: A

Solution :

                 Rubber is a natural ploymer. It is a polymer of isoprene. \[\underset{isopropene}{\mathop{C{{H}_{2}}-\overset{\begin{smallmatrix}  C{{H}_{3}} \\  | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}}}\,\]                 \[\underset{natural\text{ }rubber}{\mathop{\xrightarrow{{}}\,\,\left( -C{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}- \right)}}\,\] Nylon-6, Nylon-6 6 and Nylon-6, 10 are synthetic polymer or man made polymers. Nylon-6 It is the polymer of caprolactum.                 Nylon-6, 6 It is the polymer of hexamethylenediamine and adipic acid. \[\underset{\begin{smallmatrix}  hexamethylene \\  diamine \end{smallmatrix}}{\mathop{n{{H}_{2}}N-{{(C{{H}_{2}})}_{6}}N{{H}_{2}}}}\,+nOH-\]\[\underset{adipic\text{ }acid}{\mathop{\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}{{)}_{4}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,-OH}}\,\] \[\underset{nylon,\text{ }6,\text{ }6}{\mathop{\xrightarrow{{}}\,\,\,{{\left[ -\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{N}}\,-{{(C{{H}_{2}})}_{6}}-\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{N}}\,-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-{{(C{{H}_{2}})}_{4}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,- \right]}_{n}}}}\,\] Nylon-6, 10 It is polymer of          hexamethylenediaminie and sebacic acid. \[n{{H}_{2}}N-{{(C{{H}_{2}})}_{6}}N{{H}_{2}}+nHOOC+nHOOC-\]\[{{(C{{H}_{2}})}_{8}}-COOH\]                                                                 \[\xrightarrow[-2n{{H}_{2}}O]{}\] \[\underset{nylon,\text{ }6,\text{ }10}{\mathop{\xrightarrow{{}}\,\,\,{{\left[ -NH-{{(C{{H}_{2}})}_{6}}-\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{N}}\,-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-{{(C{{H}_{2}})}_{8}}-\overset{\begin{smallmatrix}  O \\  || \end{smallmatrix}}{\mathop{C}}\,- \right]}_{n}}}}\,\]