What is IUPAC name for isophthalic acid

Options

A. Benzene – 1, 3 dicarboxylic acid
B. Benzene – 1, 2 dicarboxylic acid
C. Benzene – 1, 4 dicarboxylic acid
D. Benzene – 1, 5 dicarboxylic acid

Explanation

To determine the IUPAC name for isophthalic acid, we can follow these steps:

### Step 1: Identify the Structure
Isophthalic acid is a type of aromatic dicarboxylic acid. Its structure consists of a benzene ring with two carboxylic acid groups (-COOH) attached to it.

### Step 2: Locate the Carboxylic Acid Groups
In isophthalic acid, the two carboxylic acid groups are located at the 1 and 3 positions of the benzene ring. This means that the carboxylic acid groups are separated by one carbon atom on the ring.

### Step 3: Number the Carbon Atoms
To name the compound, we need to number the carbon atoms in the benzene ring. We start numbering from one of the carboxylic acid groups:
- The first carboxylic acid group is at position 1.
- The second carboxylic acid group is at position 3.

### Step 4: Write the IUPAC Name
According to IUPAC nomenclature, we name the compound based on the positions of the carboxylic acid groups:
- Since there are two carboxylic acid groups, we use the prefix "dicarboxylic acid."
- The name is derived from the base name of the benzene ring, which is "benzene."
- The positions of the carboxylic acid groups are indicated as "1,3."

Thus, the IUPAC name for isophthalic acid is **benzene-1,3-dicarboxylic acid**.

### Summary
The IUPAC name for isophthalic acid is benzene-1,3-dicarboxylic acid.

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