Common name of Ethane -1,2- dioic acid is known as

Options

A. Oxalic acid
B. Phthalic acid
C. Adipic acid
D. Acetic acid

Explanation

To find the common name of Ethane-1,2-dioic acid, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**:
- Ethane-1,2-dioic acid has the molecular formula C2H2O4. The term "ethane" indicates that there are 2 carbon atoms in the chain. The "1,2-dioic acid" part indicates that there are carboxylic acid (-COOH) groups attached to the first and second carbon atoms.

2. **Draw the Structure**:
- The structure can be drawn as follows:
```
HOOC-CH2-COOH
```
- This shows that there are two carboxylic acid groups attached to the first and second carbon of the ethane chain.

3. **Determine the Common Name**:
- The common name for Ethane-1,2-dioic acid is derived from its structure. It is widely known as **Oxalic acid**.

4. **Conclusion**:
- Therefore, the common name of Ethane-1,2-dioic acid is **Oxalic acid**.

### Final Answer:
The common name of Ethane-1,2-dioic acid is **Oxalic acid**.

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