Question detail

What is the repeating unit of the polyester formed from ethylene glycol and terephthalic acid?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Polymers (A-level only)

Question

A. [-O-(C6H4)-CO-]
B. [-O-(CH2)-CO-]
C. [-NH-(C6H4)-CO-]
D. [-O-(C2H4)-CO-]

Answer

[-O-(C6H4)-CO-]

Explanation

The repeating unit of the polyester formed from ethylene glycol and terephthalic acid is [-O-(C6H4)-CO-], which reflects the structure of the polymer formed through condensation polymerization.

Common mistake

Incorrect Monomer Identification

Students often confuse the monomers used in polyesters and polyamides, leading to incorrect repeating units.

Review the structures of common monomers like ethylene glycol and terephthalic acid for polyesters, and hexamethylenediamine and adipic acid for polyamides. Practice drawing their structures to reinforce understanding.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move