What functional group(s) is(are) in 4-hydroxoybenzoic acid?

My Answer: Would it be carboxylic acid and an ester?

2 answers

Carboxylic acid is correct.
The OH group is a phenol group (an alcohol on R group but phenol group when attached to an aromatic ring (AR).
So it isn't an ester? It is just a carboxylic acid? I'm just confused with the naming because of the hydroxy