Ethenoic

Ethenoic is a term that can refer to a few different chemical concepts, most commonly related to unsaturated organic compounds. The "etheno" prefix indicates a two-carbon chain with a double bond, derived from ethene. The "oic" suffix typically denotes a carboxylic acid group, meaning a carbon atom double-bonded to one oxygen atom and single-bonded to a hydroxyl group. Therefore, "ethenoic acid" would refer to a molecule with a two-carbon backbone containing a double bond and a carboxylic acid functional group.

However, the specific arrangement of these components is crucial. If the double bond and carboxylic acid are on adjacent carbons, this would be an unsaturated carboxylic acid. A common example of this type of structure is acrylic acid, which is systematically named propenoic acid. The term "ethenoic" itself is not a standard IUPAC nomenclature for a common, standalone molecule but is more likely to appear as a fragment or in a less formalized context. It might also be used informally to describe a hypothetical or intermediate species in a chemical reaction. The precise meaning of "ethenoic" is best understood within the specific chemical context in which it is encountered.