What is the IUPAC name for a compound with a phenyl group attached to a propane?

The IUPAC name for a compound featuring a phenyl group attached to a propane is indeed propylbenzene. The naming is based on the longest carbon chain that includes the functional groups present. In this case, the propane serves as the main carbon chain, consisting of three carbon atoms, while the phenyl group, derived from benzene, is treated as a substituent.

In this context, the nomenclature follows a straightforward guideline: the parent chain (propane) is identified first, and the phenyl group attached to it is recognized as a substituent. The result is that the compound is referred to as propylbenzene, highlighting its structure of a propyl group (C3H7) bonded to the benzene ring (C6H5).

Other names in the options, such as benzopropane and phenylpropane, are not standard IUPAC terminology for this compound configuration. Benzopropane suggests a different structural relationship between the phenyl and propane groups, which is not accurate in this case.