IUPAC name of oxalic acid will be :-

Options

A. Ethane dioic acid
B. Ethane di carboxylic acid
C. Diethanoic acid
D. Diethane carboxylic acid

Answer

To determine the IUPAC name of oxalic acid, we can follow these steps:

### Step 1: Identify the Structure of Oxalic Acid
Oxalic acid has the following structure:

```
O
||
H-C-C-H
||
O
H
```

This structure shows that oxalic acid contains two carbon atoms, each bonded to a carboxylic acid group (-COOH).

### Step 2: Count the Carbon Atoms
In oxalic acid, we have a total of 2 carbon atoms.

### Step 3: Determine the Parent Hydrocarbon Name
The parent hydrocarbon for 2 carbon atoms is "ethane".

### Step 4: Identify the Functional Groups
Since oxalic acid contains two carboxylic acid groups (-COOH), we need to indicate this in the name. The presence of two carboxylic acid groups means we use the prefix "di-" to denote two functional groups.

### Step 5: Combine the Information
According to IUPAC nomenclature rules, we combine the parent hydrocarbon name with the functional group information. For a compound with two carboxylic acid groups derived from ethane, we use "ethane" and add "dioic acid" to indicate the presence of two carboxylic acid groups.

### Final IUPAC Name
Thus, the IUPAC name of oxalic acid is **ethanedioic acid**.