Glutaric acid is :

Options

A. butane-1, 4-dioic acid
B. propane-1, 3-dioic acid
C. pentane-1, 5-dioic acid
D. hexane-1, 4-dioic acid

Explanation

To determine what glutaric acid is, we can follow these steps:

### Step 1: Identify the Structure of Glutaric Acid
Glutaric acid is a dicarboxylic acid with the chemical formula C5H8O4. Its structure consists of a five-carbon chain (pentane) with two carboxylic acid (-COOH) groups at both ends.

### Step 2: Draw the Structure
The structure can be represented as follows:
- Start with a five-carbon chain: CH2-CH2-CH2-CH2-CH2
- Add the carboxylic acid groups at both ends:
- CH2-COOH (at one end)
- COOH-CH2 (at the other end)

So, the complete structure is:
```
COOH
|
CH2-CH2-CH2-CH2-COOH
```

### Step 3: Assign the IUPAC Name
According to IUPAC naming conventions:
- The longest carbon chain containing both carboxylic acid groups is identified, which has 5 carbons (pentane).
- The carboxylic acid groups are at positions 1 and 5, hence the name includes "1,5-dioic."
- The suffix for carboxylic acids is "-oic acid."

Thus, the IUPAC name is **pentane-1,5-dioic acid**.

### Step 4: Conclusion
Glutaric acid is a dicarboxylic acid with the IUPAC name pentane-1,5-dioic acid.

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