Ethylene glycol and terephthalic acid are the monomeric unit for the formation of:

Dacron

The correct answer is option 1. Dacron.

Let us break down the formation of Dacron (polyethylene terephthalate, PET) from its monomers, ethylene glycol and terephthalic acid:

Monomers

Ethylene Glycol : This compound has two hydroxyl groups (-OH), one on each end of the molecule.

Terephthalic Acid: This compound has two carboxyl groups (-COOH) positioned para to each other on a benzene ring.

Condensation Reaction

When ethylene glycol and terephthalic acid react, they undergo a condensation reaction. This type of reaction involves the formation of ester bonds between the hydroxyl groups of ethylene glycol and the carboxyl groups of terephthalic acid, with the release of water molecules. The reaction will be as follows:

The polymerization of ethylene glycol and terephthalic acid involves a condensation reaction where ester bonds are formed, resulting in the polymer PET. This process releases water and produces a long-chain polymer that exhibits desirable properties for various industrial and consumer applications.