carboxyl
an oxygen atom is double bonded to a carbon atom that is also bonded to an -OH group- carboxylic acid
Carboxyl is a functional group consisting of one carbon atom, two oxygen atoms (one double-bonded and one single-bonded), and a hydrogen atom. The carboxyl group is typically represented as -COOH or -CO2H in chemical structures.
Carboxyl groups are important in a variety of biochemical processes, including the metabolism of fats and carbohydrates. They are also responsible for the acidic character of many organic compounds, as they can donate a proton to water molecules to form a hydronium ion (H3O+) and a carboxylate ion (COO-). This acidity is measured by the pKa value, which is typically between 3 and 5 for a carboxyl group.
Examples of compounds containing carboxyl groups include acetic acid (CH3COOH), aspartic acid (an amino acid), and citric acid (found in citrus fruits). Carboxyl groups are also important in the formation of peptides and proteins, as they can react with amino groups (-NH2) to form peptide bonds.
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