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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.
Lewis acid is a chemical species that reacts with a Lewis base to form a Lewis adduct. A Lewis base, then, is any species that donates a pair of electrons to a Lewis acid to form a Lewis adduct. For example, OH â and NH 3 are Lewis bases, because they can donate a lone pair of electrons.In the adduct, the Lewis acid and base share an electron pair furnished by the Lewis base.sually the terms Lewis acid and Lewis base are defined within the context of a specific chemical reaction. For example, in the reaction of Me3B and NH3 to give Me 3 BNH 3, Me 3 B acts as a Lewis acid, and NH 3 acts as a Lewis base.