Question

The IUPAC name of the following molecule is: 

 

• A. 2-Methyl-5-nitro-1-chlorobenzene
• B. 3-Chloro-4-methyl-1-nitrobenzene
• C. 2-Chloro-1-methyl-4-nitrobenzene
• D. 2-Chloro-4-nitro-1-methylbenzene

Hint:

In benzene derivatives, numbering starts from the highest priority group to ensure the lowest numbering sequence.

Answer 1

The Correct Option is C

Step 1: IUPAC Nomenclature Rule Application
The benzene ring's longest carbon chain serves as the parent structure. Substituents are numbered according to priority to achieve the lowest possible locant sum. 
Step 2: Benzene Ring Prioritization and Numbering 
The methyl group (\(-CH_3\)) is assigned priority 1. The chlorine group (\(-Cl\)) is assigned position 2, and the nitro group (\(-NO_2\)) is assigned position 4. 
Step 3: Compound Identification 
The compound's IUPAC name is 2-Chloro-1-methyl-4-nitrobenzene. Therefore, option (C) is the correct designation.