IUPAC naming of alkenes involves similar rules to alkanes, with some additional considerations for the double bond. Here's a brief overview: IUPAC Rules for Alkenes 1. *Longest Chain Rule*: Identify the longest continuous chain of carbon atoms that contains the double bond. 2. *Parent Name*: Determine the parent name based on the number of carbon atoms in the longest chain, replacing the "-ane" suffix with "-ene" (e.g., ethene, propene). 3. *Double Bond Location*: Indicate the location of the double bond by assigning the lowest possible number to the first carbon atom of the double bond. 4. *Substituents*: Identify and name any substituents (alkyl groups) attached to the parent chain. Examples 1. *Ethene (C2H4)*: Simplest alkene, two carbon atoms with a double bond. 2. *Propene (C3H6)*: Three carbon atoms with a double bond between the first and second carbon atoms. IUPAC Naming Steps 1. Identify the longest chain containing the double bond. 2. Determine the parent name and replace "-ane" with "-ene". 3. Indicate the double bond location. 4. Identify and name substituents. 5. Combine the information to form the IUPAC name. Additional Considerations 1. *Stereochemistry*: If the alkene has substituents on the same side of the double bond, it can be designated as "Z" (cis) or "E" (trans).