a) 1999
b) 1985
c) 1915
d) 1935
Answer: d
Explanation: Nylon, a synthetic polymer, was produced in 1935. Nylon was developed by a research team at DuPont, headed by an American chemist, Wallace H. Carothers. It was made by the chemical synthesis of adipic acid and hexamethylrnrdiamine mainly, by condensation polymerisation.
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