Which of the following is the IUPAC name of m-Dichlorobenzene?

The correct option is 1,3-Dichlorobenzene.

Step-by-step Explanation:

1. Understanding Benzene Nomenclature:
In disubstituted benzene derivatives, the relative positions of two substituents on the ring are indicated either by IUPAC numerical locants (1,2-, 1,3-, 1,4-) or by traditional prefixes (ortho, meta, para).

2. Prefix Definitions:
• ortho- (o-): Indicates substituents on adjacent carbons, corresponding to the 1,2-positions.
• meta- (m-): Indicates substituents separated by one carbon atom, corresponding to the 1,3-positions.
• para- (p-): Indicates substituents at opposite ends of the ring, corresponding to the 1,4-positions.

3. Applying to m-Dichlorobenzene:
In m-dichlorobenzene, the prefix m- (meta-) specifies that the two chlorine atoms are located at positions 1 and 3 on the benzene ring.
Hence, the systematic IUPAC name for m-dichlorobenzene is 1,3-Dichlorobenzene.