A) Sulphur hexafluoride
B) Adipic acid
C) Sulphurous acid
D) Phthalic acid
Correct Answer: B
Solution :
Nylon-66 is formed by adipic acid and hexa methylene diamine. \[n\,\underset{aadipic\,acid}{\mathop{\,HOOC-{{(C{{H}_{2}})}_{4}}}}\,-\underset{hexa\,\,methylene\,\,\text{diamine}}{\mathop{COOH+n{{H}_{2}}{{(C{{H}_{2}})}_{6}}-N{{H}_{2}}}}\,\]\[\xrightarrow{{}}{{[\underset{nylon-66}{\mathop{HN-{{(C{{H}_{2}})}_{6}}}}\,-NH-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}})}_{4}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{]}_{n}}\] \[+n{{H}_{2}}O\]
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