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A carboxyl group consists of a carbon double-bonded to an oxygen and also bonded to a-OH group. Compounds with carboxyl groups are called carboxylic acids or organic acids. The carboxyl group can act as an acid when by donating a proton (H +) to a solution and becoming ionized.
1 A Functional Group Overview In organic chemistry, a functional group is an atom or group of atoms that are responsible for the molecule's reactivity. 2  The functional groups can be determined using infrarâ¦. Functional Groups: Organic Chemistry 101 Functional groups are groups of atoms that are found in molecules, which are involved in the chemical reactions associated with those molecules.