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QUESTION

# What functional groups are present in acetaminophen?

The functional groups in acetaminophen are hydroxyl, aromatic ring, and amide.

A functional group is a specific group of atoms within a molecule that gives rise to the characteristic chemical reactions of the molecule.

The structure of acetaminophen is

The group at the top of the molecule is a hydroxyl group. It is tempting to call it an alcohol group.

But an "–OH" group attached to a benzene ring has special properties. It is more commonly called a phenol group or a phenolic "OH".

The six-membered ring is an aromatic ring.

The group at the bottom of the molecule is a monosubstituted or secondary amide.

The general formula for an amide is "RCONR"_2. In this case, one of the "R" groups on the "N" atom is a hydrogen atom.