Chemistry · May / June 2024 · Paper 12 · Question 37

The diagram shows the partial structure of a polymer. [partial polymer structure showing -C(=O)-NH- groups with two shaded boxes representing unknown groups] Which pair of reagents is used to form this polymer?

1. AHO-C(=O)-[shaded box]-NH2 and HO-C(=O)-[black box]-NH2
2. BHO-C(=O)-[black box]-C(=O)-OH and NH2-[shaded box]-C(=O)-OH
3. CNH2-[black box]-C(=O)-OH and NH2-[shaded box]-NH2
4. DNH2-[shaded box]-NH2 and HO-C(=O)-[black box]-C(=O)-OH

As printed in the paper