New groups and naming aromatics
New groups and naming aromatics
- At A Level you meet more functional groups, including the amide and aromatic compounds.
- Aromatic compounds are built on a benzene ring.
- They are named using the ring as the parent.
Practice
Which new functional group is introduced at A Level?
A Level adds groups such as the amide, plus aromatic chemistry.
Aromatic compounds
- Benzene is a ring of six carbons; aromatic compounds are built on it.
- As always, the functional group decides the properties, read from the formula.
Practice
Aromatic compounds are built on a:
Aromatic compounds contain a benzene ring; new families also include the amide group.
Naming
- Use the benzene ring as the parent and number the substituent positions.
- e.g. 3-nitrobenzoic acid (a $\text{–NO}_2$ on carbon 3), 2,4,6-tribromophenol (three Br on a phenol ring).
Practice
When naming an aromatic compound, you:
e.g. 3-nitrobenzoic acid puts a –NO₂ on carbon 3 of the ring.
You've got it
Key idea
- new groups at A Level include the amide and aromatic (benzene-based) compounds
- aromatic compounds are named with the benzene ring as the parent, numbering the substituents
- the functional group still decides the properties