What is the IUPAC name for C2H3Cl?

The compound with the molecular formula C2H3Cl has an alkene structure due to the presence of a double bond between the two carbon atoms. The "C2" indicates there are two carbon atoms, while "H3" shows that there is one less hydrogen than in the saturated alkane (ethane, C2H6). The presence of the chlorine atom (Cl) also affects the naming.

Given these characteristics, the correct IUPAC name "Chloroethene" is derived. The "chloro-" prefix denotes the presence of the chlorine substituent, and "ethene" refers to the two-carbon alkene framework, which is characteristic of compounds with double bonds. This nomenclature appropriately reflects both the structure and the substituent present in the compound.

The other names listed do not accurately fit the structure of C2H3Cl. "Chloroethane" would imply a saturated molecule with single bonds, which does not match the given formula with only three hydrogens. "Ethane" and "ethylene" do not account for the presence of chlorine or the unsaturation, making them inappropriate for this compound. Therefore, "Chloroethene" correctly represents the compound as an unsaturated