High molecular mass macromolecules are called polymers which consist of repeating structural units derived from corresponding monomers. These polymers can be classified in a number of ways, such as based on their source, method of preparation intermolecular forces of attraction etc.
Natural rubber is a polymer of cis-1, 4-isoprene and can be made tough with vulcanisation process. Polymers are useful in manufacturing of various materials such as toys, fibres, pipes, television cabinets etc.
In view of potential environmental hazards of waste disposal certain biodegradable polymers are synthesised such as PHBV.
Based on the paragraph given above answer the questions
Which of the following polymers is prepared by using monomers ethylene glycol and phthalic acid?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Glyptal
Glyptal is a polyester made by condensation polymerisation of ethylene glycol and phthalic acid; it is used in the manufacture of paints and lacquers.
n \( \ce{HOCH2-CH2OH} \) + n \( \ce{C6H4(COOH)2} \) → –[OCH2–CH2OOC–C6H4–CO]n– + 2n \( \ce{H2O} \)
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Polymers of Commercial Importance – …
