The table gives the functional groups in four compounds. Which pair of compounds could react together to produce a polyester?
Table: The functional groups in four compounds
| Compound | Functional groups |
|---|---|
| P | two -OH\text{-OH}-OH groups |
| Q | one -OH\text{-OH}-OH group |
| R | two -COOH\text{-COOH}-COOH groups |
| S | one -NH2\text{-NH}_2-NH2 group and one -COOH\text{-COOH}-COOH group |
P and Q
P and R
Q and R
R and S
40 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.