Naming aromatic compounds

Compounds with one substituent group

Aromatic compounds with one substituent group are monosubstituted

The benzene ring is often considered to be the parent chain 

Alkyl groups (CH3, C2H5) and halogens (F, Cl, Br, I)  and nitro groups (NO2) are all considered prefixes to benzene. 

nitrobenzene:Image result for nitrobenzene

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Compounds with one substituent group

When a benzene ring is attached to an alkyl chain with a functional group or to an alkyl chain with seven or more carbon atoms, benzene is considered a substituent. Instead of benzene the prefix phenyl is used in the name. 

Image result for phenyl ethanone (http://www.chemsynthesis.com/molimg/1/big/0/463.gif)phenylethanone

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Compounds with more than one substituent group

Some compounds may contain more than one substituent on the benzene ring for example disubstituted compounds have two substituent groups. The ring is now numbered just like a carbon cahin starting with one of the substituent groups. The substituent groups are listed in alphabetical order using smallest numbers possible.

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