A polyester is made from two monomers. One of the monomers is HO-CH2-CH2-CH2-CH2-CH2-OH\text{HO-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-OH}HO-CH2-CH2-CH2-CH2-CH2-OH.
The table shows four compounds.
| Compound | Formula |
|---|---|
| W | CH3-CH2-CH2-CH2-COOH\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}CH3-CH2-CH2-CH2-COOH |
| X | HO-CH2-CH2-CH2-OH\text{HO-CH}_2\text{-CH}_2\text{-CH}_2\text{-OH}HO-CH2-CH2-CH2-OH |
| Y | HOOC-CH2-CH2-CH2-COOH\text{HOOC-CH}_2\text{-CH}_2\text{-CH}_2\text{-COOH}HOOC-CH2-CH2-CH2-COOH |
| Z | H2N-CH2-CH2-CH2-NH2\text{H}_2\text{N-CH}_2\text{-CH}_2\text{-CH}_2\text{-NH}_2H2N-CH2-CH2-CH2-NH2 |
Which compound could be the other monomer?
Compound W
Compound Z
Compound Y
Compound X
94 exam-style questions on AQA GCSE Chemistry 7.3 Synthetic and naturally occurring polymers, covering 7.3.1 Addition polymerisation, 7.3.2 Condensation polymerisation, 7.3.3 Amino acids, and 7.3.4 DNA (deoxyribonucleic acid) and other naturally occurring polymers. Each one has a worked solution and a mark scheme showing where the marks go.