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B
Ethylene glycol and phthalic acid
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C
Ethylene glycol and adipic acid
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D
Caprolactum
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Solution
The correct option is D Ethylene glycol and phthalic acid
Glyptal - a polyester, is formed by ethylene glycol and phthalic acid formed by step-growth polymerization as shown in the above reaction. Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long chain polymers.