The IUPAC name of the following compound is
`{:(CH_(2)-CH--CH_(2)),("|"" |"" |"),(CN" "CN" "CN):}`

Explanation

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

### Step 1: Identify the longest carbon chain
The compound has a branched structure with a total of 5 carbon atoms in the longest chain. This chain is a pentane.

**Hint:** Look for the longest continuous chain of carbon atoms to determine the base name of the compound.

### Step 2: Identify the functional groups
In the given compound, there are three cyano (–CN) groups attached to the carbon chain.

**Hint:** Functional groups can change the name of the compound, so make sure to identify all of them.

### Step 3: Number the carbon chain
Number the carbon chain from the end closest to the first functional group. In this case, we can start numbering from the end of the chain nearest to the first cyano group. This gives us the following numbering:
1. C1 - CN
2. C2 - CN
3. C3 - CN
4. C4 - CH2
5. C5 - CH3

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

### Step 4: Write the name of the compound
Since there are three cyano groups, we will use the prefix "tri-" to indicate three cyano groups. The position of the cyano groups will be indicated by their respective carbon numbers. Therefore, the IUPAC name will be:
- 3-cyanopentane-1,1,1-tricarbonitrile

**Hint:** Combine the substituents with their positions and the base name to form the complete IUPAC name.

### Final IUPAC Name
The final IUPAC name of the compound is **3-cyanopentane-1,1,1-tricarbonitrile**.