Identify the monomers used in preparation of dacron .

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Dacron, also known as terylene, is a polyester polymer.

It is prepared by the condensation polymerization of ethylene glycol (ethane-1,2-diol) and terephthalic acid (benzene-1,4-dicarboxylic acid) at high temperatures.

The chemical structure of ethylene glycol is $HO - (CH_{2})_{2} - OH$ .

The chemical structure of terephthalic acid is a benzene ring with two carboxylic acid groups at para positions, i.e., $HOOC - C_{6} H_{4} - COOH$ .

These structures match the ones provided in the image.

Answer:

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