The starting material used for the preparation of decron is

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Dacron, also known as Terylene, is a well-known polyester. It is synthesized by the condensation polymerization of ethylene glycol (ethane-1,2-diol) and terephthalic acid (benzene-1,4-dicarboxylic acid) at a temperature of 420 to 460 K in the presence of a catalyst such as zinc acetate-antimony trioxide. The reaction involves the elimination of water molecules to form ester linkages. Therefore, the starting materials for the preparation of Dacron are ethylene glycol and terephthalic acid. Answer: Ethylene glycol an