1. Definition
- Aromatic compounds are compounds that have a special type of ring structure with electrons shared across the ring, making them very stable.
- Aliphatic compounds are compounds that do not have these special rings. They can be straight chains, branched chains, or regular non-aromatic rings.
2. Structure
- Aromatic compounds always have a cyclic structure with a system of shared electrons.
- Aliphatic compounds can be straight, branched, or cyclic, but their rings are not special like aromatic rings.
3. Bonding
- In aromatic compounds, the bonds in the ring are delocalized and give extra stability.
- In aliphatic compounds, the bonds are regular single, double, or triple bonds without this extra stability.
4. Chemical Behavior
- Aromatic compounds usually undergo substitution reactions (parts of the molecule are replaced without breaking the ring).
- Aliphatic compounds usually undergo addition or oxidation reactions (bonds are broken and new ones are formed).
5. Stability
- Aromatic compounds are generally very stable because of their special electron arrangement.
- Aliphatic compounds are less stable and more reactive, depending on their type of bond.
6. Examples
- Aromatic: Compounds like benzene and toluene.
- Aliphatic: Compounds like methane, ethane, and regular cyclic compounds like cyclohexane.
Summary in one line:
Aromatic compounds have special stable rings with shared electrons, while aliphatic compounds do not have these rings and can be straight, branched, or normal rings.