Q72 · Practice questionComplex familiar4 marks
QUESTION 72 (4 marks)
The two displayed monomers are used to make nylon-6,6.
a) Draw one repeat unit, showing bonds that continue into adjacent units. [2 marks]
b) Name the linkage formed and the small molecule eliminated. [2 marks]
WORKED SOLUTION
4 marksPractice marking scheme
Repeat unit ; amide linkage; water.
Each amine reacts with a carboxylic acid group, giving –CONH– and water. The repeat unit includes both monomer residues and open bonds at both ends.
- Correct diamine and diacid residues. [1 marks]
- Correct amide links and continuing bonds. [1 marks]
- Names amide linkage. [1 marks]
- Identifies water. [1 marks]
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