Find the product in the reaction given below

Step-by-step solution

Glyptal a polyester, is formed by ethylene glycol and phthalic acid formed by step growth polymerisation as shown in the above reaction. Step-growth polymerisation refers to a type of polymerisation mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers longer oligomers and eventually long chain polymers. Hence, the correct option is (3).