A student named a certain compound as `2,3-` diethylbutane. Its correct `IUPAC` names is

Options

A. `2,3-`Dimethylhexane
B. `3,4-`Dimethylhexane
C. `2-`Ethyl`-3-`methylpentane
D. `2-`Ethylbutane

Explanation

To determine the correct IUPAC name for the compound initially named as `2,3-diethylbutane`, we will follow these steps:

### Step 1: Identify the Longest Carbon Chain
The name `butane` suggests that the longest continuous carbon chain should contain four carbon atoms. However, the presence of `diethyl` indicates that there are two ethyl groups attached to the main chain.

### Step 2: Draw the Structure
Based on the name `2,3-diethylbutane`, we can draw a structure with a four-carbon chain (butane) and two ethyl groups on the second and third carbon atoms.

```
C2H5
|
C2H5-C-C-C
```

### Step 3: Count the Carbons
Upon drawing the structure, we see that there are actually more than four carbon atoms present due to the two ethyl groups. Each ethyl group contributes two carbon atoms, which means the total number of carbon atoms is:
- 4 (from butane) + 2 (from one ethyl) + 2 (from the other ethyl) = 8 carbons.

### Step 4: Determine the Correct Parent Chain
Since there are 8 carbon atoms, the parent chain should be named as `octane`, not `butane`.

### Step 5: Identify the Substituents
Now, we need to identify the positions of the ethyl groups on the octane chain. The structure can be represented as follows:
```
C2H5
|
C2H5-C-C-C-C-C
```
The ethyl groups are located on the 2nd and 3rd carbon atoms of the octane chain.

### Step 6: Write the Correct IUPAC Name
The correct IUPAC name for the compound, considering the longest chain and the positions of the substituents, is `3,4-diethyloctane`.

### Final Answer
The correct IUPAC name is **3,4-diethyloctane**.

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