IUPAC name of name of the given compound is :
`H-overset(O)overset(||)(C )-CH_(2)-underset(CH_(3))underset(|)underset(CH_(2))underset(|)(C )H-C-=N`

Options

A. 3-Carbonitrile-3-ethylbutanal
B. 3-fromyl-2-ethylpropanenitrile
C. 3-Cyano-3-ethylbutanal
D. 2-Ethyl-4-oxobutanenitrile

Explanation

To determine the IUPAC name of the given compound, we will follow these steps:

### Step 1: Identify the Longest Carbon Chain
First, we need to identify the longest continuous carbon chain in the compound. In this case, we can see that there is a four-carbon chain.

**Hint:** Look for the longest continuous chain of carbon atoms in the structure.

### Step 2: Number the Carbon Chain
Next, we will number the carbon chain from the end that gives the substituents the lowest possible numbers. We will start numbering from the end closest to the functional groups.

**Hint:** Always number the chain in a way that gives the lowest numbers to the substituents and functional groups.

### Step 3: Identify Functional Groups and Substituents
In the compound, we have:
- A cyano group (–C≡N)
- An aldehyde group (–CHO, which is represented as an oxo group in IUPAC naming)
- An ethyl group (–C2H5)

**Hint:** Identify all functional groups and substituents attached to the main carbon chain.

### Step 4: Assign Locants to Substituents
From our numbering, we can assign locants to the substituents:
- The cyano group is at position 1.
- The ethyl group is at position 2.
- The oxo group (aldehyde) is at position 4.

**Hint:** Use the numbering to determine the positions of each substituent.

### Step 5: Construct the IUPAC Name
Now, we can construct the IUPAC name using the following format:
- Start with the substituents in alphabetical order, followed by the base name of the longest chain and the functional groups.
- The base name for a four-carbon chain is "butane."
- The substituents are "2-ethyl" and "4-oxo" (the oxo group indicates an aldehyde).

So, the IUPAC name will be: **2-ethyl-4-oxo-butane-1-nitrile.**

**Hint:** Combine the substituents and the main chain name, ensuring to follow the correct order and punctuation.

### Final Answer
The IUPAC name of the given compound is **2-ethyl-4-oxo-butane-1-nitrile.**