# Naming Convention: 2,4-dichlorophenylacetic acid [closed]

Why is this the correct name for this compound? I understand the 2,4-dichloro part, but...

1. Why is it a phenol if there is no hydroxyl group directly bonded to the hydrocarbon ring?

2. Why is it an acetic acid if it has a CH2COOH instead of a CH3COOH branch on it?

## closed as off-topic by Tyberius, Jon Custer, user55119, Mithoron, aventurinJan 2 at 20:15

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For reasons passing understanding, a cyclic, aromatic, $\ce{C6H5}$ radical fragment (so a benzene minus one $\ce{H}$) is called "phenyl" for the purpose of nomenclature.
I doubt that "2,4-dichlorophenylacetic acid" is a truly IUPAC conforming name, so I'll outline the evolution of this name instead. First, there is acetic acid. You substitute one of the methyl $\ce{H}$s by phenyl: phenylacetic acid (tough to get nowadays, thanks to meth cookers). Now you substitute chlorine atoms for $\ce{H}$s on phenyl, voila.