1. | A |
2. | B |
3. | B |
4. | A |
5. | A |
6. | A |
7. | C |
8. | B |
9. | D |
10. | D |
11. | |
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12. | |
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13. | |
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14. | |
C | |
15. | |
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16. | |
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17. | |
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18. | |
D | |
19. | |
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20. | |
D
Two opportunities for hydrogen bonding in D. Only one opportunity for hydrogen bonding in A-C |