Which organic compound has the structure R−COOH, with R referring to the alkyl, alkenyl, aryl, or other group?
Carboxylic acid
The organic compound with the structure $\text{R-COOH}$ belongs to the class known as carboxylic acids.
Here is a quick breakdown of what makes up this functional group:
The Carboxyl Group ($-\text{COOH}$): This is the functional group itself. It gets its name because it is a combination of a carbonyl group ($>\text{C}=\text{O}$) and a hydroxyl group ($-\text{OH}$) attached to the same carbon atom.
The R-Group: As you mentioned, this can be an alkyl (like methyl, $-\text{CH}_3$), alkenyl, or aryl (benzene ring) group. If the R-group is just a hydrogen atom ($\text{H}$), it forms formic acid ($\text{HCOOH}$), the simplest carboxylic acid.
Common Examples
| Compound Name | IUPAC Name | Formula | Where it's found |
|---|---|---|---|
| Acetic acid | Ethanoic acid | $\text{CH}_3\text{COOH}$ | Vinegar |
| Formic acid | Methanoic acid | $\text{HCOOH}$ | Ant stings |
| Citric acid | 2-hydroxypropane-1,2,3-tricarboxylic acid | $\text{C}_6\text{H}_8\text{O}_7$ | Citrus fruits |
| Benzoic acid | Benzenecarboxylic acid | $\text{C}_6\text{H}_5\text{COOH}$ | Food preservatives (aryl group example) |
Key Properties
Because the $-\text{OH}$ group is highly polar, carboxylic acids can form strong hydrogen bonds with each other and with water. This gives them relatively high boiling points compared to other organic molecules of similar size, and makes the smaller-chain acids highly soluble in water. They are typically weak acids, meaning they partially dissociate in water to release hydrogen ions ($\text{H}^+$).
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