How do you identify whether a functional group is acidic or basic? For example, which of these functional groups are acidic and which are basic? - Hydroxyl - Carbonyl - Carboxyl - Amino - Sulfhydryl - Phosphate
Normally the Carboxyl groups are acidic in nature.
The Carbonyl group is also uncharged but is a little hydrophillic.
Thus the compounds given by you can be classified as:-