The correct IUPAC name of the following compound is `O=CH-CH_(2)-underset(H-C=O)underset(|)(CH)-CHO`

Options

A. 1,1-diformyl propananl
B. 3-formyl butanedial
C. 2-formyl butanedial
D. 1,1,3-ethane tricarbaldehyde

Explanation

To determine the correct IUPAC name for the compound `O=CH-CH2-CH(CH)=O`, we will follow the systematic steps of IUPAC nomenclature.

### Step-by-Step Solution:

1. **Identify the Parent Chain:**
The first step in naming an organic compound is to identify the longest continuous carbon chain that contains the highest priority functional groups. In this case, we have a chain of 4 carbon atoms.

**Hint:** Look for the longest chain that includes all functional groups.

2. **Number the Carbon Chain:**
Number the carbon chain from the end closest to the functional groups. The carbon chain is numbered from right to left to give the aldehyde groups (CHO) the lowest possible numbers. This gives us the numbering:
- C1: CHO (aldehyde)
- C2: CH2
- C3: CH
- C4: CHO (aldehyde)

**Hint:** Always number the chain to give the functional groups the lowest numbers.

3. **Identify Functional Groups:**
In this compound, we have two aldehyde groups (CHO) at C1 and C4. Aldehydes are given priority in nomenclature.

**Hint:** Identify and prioritize functional groups based on their position and type.

4. **Determine the Base Name:**
The base name for a four-carbon chain is "butane." However, since we have aldehyde groups, the suffix will change to "butanal." Since there are two aldehyde groups, we will use the prefix "dial" to indicate their presence.

**Hint:** The base name changes according to the functional groups present.

5. **Combine the Elements:**
Since we have two aldehyde groups, we will use "butanedial" as the base name. The final name will be "butanedial" because we remove the "e" from "butane" to accommodate the "dial" suffix.

**Hint:** When multiple functional groups are present, adjust the base name accordingly.

6. **Final IUPAC Name:**
Therefore, the correct IUPAC name for the compound `O=CH-CH2-CH(CH)=O` is **butanedial**.

### Summary:
The correct IUPAC name for the compound is **butanedial**.