Question

The IUPAC name of the compound given below

• A. p-Nitroaniline
• B. 4-Nitroaniline
• C. 4-Nitro-1-aminobenzene
• D. 1-Amino-4-nitrobenzene

Answer 1

Answer: (B)

4-Nitroaniline

Answer 2

The given compound is a benzene ring substituted with an amino group ($\text{NH}_2$) and a nitro group ($\text{NO}_2$) at para positions relative to each other.

According to IUPAC nomenclature, when a benzene ring is substituted with an amino group, the compound is called aniline. Aniline is a retained trivial name and is used as a parent name. The carbon atom bonded to the amino group is numbered 1. In this case, the nitro group is at the para position relative to the amino group, which corresponds to position 4 when the amino group is at position 1.

Therefore, the IUPAC name is 4-nitroaniline.