How do you name a compound with three carbon atoms and a double bond in the first position?

The naming of a compound with three carbon atoms and a double bond in the first position correctly aligns with the structure of prop-1-ene. In organic nomenclature, the prefix "prop-" indicates that there are three carbon atoms in the longest continuous chain. Since the compound contains a double bond, which is specified by the suffix "-ene," the position of the double bond is indicated by the number.

In this case, "1" denotes that the double bond starts at the first carbon atom in the chain, making the full name prop-1-ene appropriate for the structure described. This reflects both the number of carbon atoms and the correct placement of the double bond clearly.

In contrast, other names presented do not accurately represent a compound with three carbon atoms and the specified double bond configuration. For instance, the names but-1-ene and eth-1-ene refer to compounds with four and two carbon atoms, respectively, while prop-2-ene incorrectly suggests the placement of the double bond between the second and third carbon atom, rather than at the first position.