Chemistry - Nomenclature Question with Solution | TestHub

The number of compounds with correct IUPAC names is 3 (compounds c, d, and e).

Structure (a) is incorrect because the preferred IUPAC parent name for a benzene ring with a carboxylic acid group is benzoic acid.

Structure (b) is incorrect because the $-CHO$ group has higher priority than $-N{O}_2$, meaning the parent name must be benzaldehyde.

Structures (c), (d), and (e) follow standard IUPAC rules for principal functional group priority and alphabetical substituent numbering.