Circle all carbon centers that are at the same oxidation state as a carboxylic acid. 
Definitions:
Ester Functional Group
A chemical functional group derived from an acid where at least one –OH (hydroxyl) group is replaced by an –O– (oxy) group.
Ketone Group
A functional group in organic chemistry characterized by a carbon atom double-bonded to an oxygen atom, with two other carbon atoms attached.
Ethylethanoate
Also known as ethyl acetate, an organic compound used as a solvent in many applications due to its pleasant smell and quick evaporation.
Methylethanoate
An ester formed from methanol and acetic acid, known for its fruity smell and used in the manufacture of flavors and fragrances.
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