A) Dimethyl terephthalate and ethylene glycol
B) Terephthalic acid and formaldehyde
C) Phenol and phthalic acid
D) Phenol and formaldehyde
Correct Answer: A
Solution :
Dacron or terylene is a condensation polymer (a polyester) of ethylene glycol and terephthalic acid. Generally dimethyl terephthalate is used inspite of terephthalic acid. \[n\,HO-C{{H}_{2}}-C{{H}_{2}}-OH\] \[+\,n\,{{H}_{3}}COOC\]\[COOC{{H}_{3}}\xrightarrow{{}}\] \[{{\underset{Dacron}{\mathop{\left[ -OC{{H}_{2}}C{{H}_{2}}O-CO\,\,\,\,\,\,\,CO- \right]}}\,}_{n}}+\,nC{{H}_{3}}OH\]
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