The IUPAC name of `{:(HO - CH - COOH), (" "|) , ( HO - CH - COOH):}`

Options

A. 2, 3-Dihydroxybutane-1, 4-carboxylic acid
B. 2, 3-Dihydroxybutane-1, 4-dioic acid
C. 1,2-Dihydroxyethane dicarboxylic acid
D. none of these

Explanation

To determine the IUPAC name of the compound given as HO-CH-COOH, we will follow the systematic steps of IUPAC nomenclature.

### Step-by-Step Solution:

1. **Draw the Structure**:
- The compound has two carboxylic acid (COOH) groups and two hydroxyl (OH) groups attached to the carbon chain. The structure can be represented as HO-CH(COOH)-CH(COOH)-OH.

2. **Identify the Longest Carbon Chain**:
- Count the number of carbon atoms in the longest continuous chain. In this case, there are 4 carbon atoms in total.

3. **Determine the Parent Chain Name**:
- The longest chain with 4 carbon atoms is called "butane".

4. **Number the Carbon Atoms**:
- Start numbering the carbon chain from the end closest to the highest priority functional group (the carboxylic acid).
- Numbering from left to right:
- C1: COOH
- C2: OH
- C3: OH
- C4: COOH

5. **Identify the Substituents**:
- The substituents are the hydroxyl (OH) groups. There are two hydroxyl groups located at carbon 2 and carbon 3.

6. **Use Appropriate Prefixes**:
- Since there are two hydroxyl groups, we use the prefix "di" to indicate their presence. Therefore, we denote them as "2,3-dihydroxy".

7. **Combine the Functional Groups**:
- The carboxylic acid groups are located at carbon 1 and carbon 4. The suffix for carboxylic acids is "oic acid".
- Since there are two carboxylic acid groups, we denote them as "1,4-dioic acid".

8. **Combine All Parts for the Final Name**:
- Combine the substituent and parent chain names along with the functional group suffix:
- The complete IUPAC name is "2,3-dihydroxybutane-1,4-dioic acid".

### Final Answer:
The IUPAC name of the compound is **2,3-dihydroxybutane-1,4-dioic acid**.