The functional groups, homologous series and reaction types that dominate the organic section.
| Group | Formula | Class |
|---|---|---|
| Hydroxyl | –OH | Alcohol |
| Aldehyde | –CHO | Aldehyde |
| Ketone | >C=O | Ketone |
| Carboxyl | –COOH | Carboxylic acid |
| Amino | –NH₂ | Amine |
| Ester | –COO– | Ester |
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