Final answer:
The correct name for 4-chlorobenzaldehyde is Chlorobenzaldehyde, as it is a benzaldehyde with a chlorine substituent. This name is accurate without the need for numbering the chlorine's position due to the aldehyde group setting the numbering sequence.
Step-by-step explanation:
The correct name for 4-chlorobenzaldehyde among the given options is Chlorobenzaldehyde. When naming a compound such as 4-chlorobenzaldehyde, the parent name is benzaldehyde, which is an aromatic ring with an aldehyde group. In this case, a chlorine substituent is attached to the benzene ring at the fourth carbon atom when numbering starts from the aldehyde attachment point. Therefore, the preferred IUPAC name does not need to include the number 4 as there is no ambiguity where the chlorine is attached, given that the aldehyde group defines the numbering starting point.
However, if the common naming system were used for the substitution patterns on a benzene ring, prefixes such as ortho, meta, and para could be seen. Still, the proper way to name the compound in question is simply chlorobenzaldehyde because it only has a single chlorine substituent in addition to the aldehyde group.
Options such as Benzal chloride, Chlorobenzene, and 4-Chlorobenzene are incorrect because they either represent different compounds or the suggested structure does not include the necessary aldehyde group (formyl group).