Which monomers can be used to produce polypropene through polymerization?

Polypropene, also known as polypropylene, is produced through the polymerization of the monomer propene. During the polymerization process, many propene molecules join together in a chain reaction to form the long polymer chains characteristic of polypropene. The structure of the propene molecule, which consists of three carbon atoms and a double bond, enables it to undergo addition polymerization efficiently.

Other choices such as ethene, butene, and hexene are different alkenes and would result in the formation of their respective polymers (polyethylene, polybutene, and polyhexene, respectively) if they were to undergo polymerization. These monomers cannot produce polypropene because they do not have the same structural composition necessary for forming the specific polymer chain found in polypropene. Thus, the correct monomer that can be used for the production of polypropene is indeed propene.