Which of the following is the structural formula for propene?

The structural formula for propene is correctly represented as CH₂=CH-CH₃. This formula illustrates the key features of propene, a three-carbon alkene. The double bond between the first two carbon atoms (indicated by the "=" symbol) highlights its classification as an alkene, which is characterized by its carbon-carbon double bond.

Propene consists of three carbon atoms in total, with the double bond positioned between the first and second carbon atoms. The remaining carbon atom is bonded to the second carbon, resulting in the structure that gives propene its unique properties, such as reactivity in addition reactions.

The correct representation clearly shows the connectivity of the carbon atoms and how they are arranged within the molecule, crucial for understanding its behavior in chemical reactions and its nomenclature.