Question

What is the correct IUPAC name for a molecule that has two amino groups in opposing (para) locations around a benzene ring?

• A. Benzenediamine
• B. Benzene-1,4-diamine
• C. p-Aminoaniline
• D. 4-Aminobenzenamine

Hint:

Number the ring so the two amino groups get the lowest locants: 1,4.

Answer 1

The Correct Option is B

Step 1: Identify
Parent ring: benzene. Substituents: two amino groups at opposite carbons.

Step 2: Name
Para means positions 1 and 4. Two identical amine groups give the suffix "diamine" with locants 1,4.

Step 3: Match
The result is benzene-1,4-diamine, option (B).

Final Answer:
Option (B). \[ \boxed{\text{Benzene-1,4-diamine}} \]