A student names 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`-methpentane
D. `2`-Ethylbutane

Answer

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

### Step 1: Identify the Longest Carbon Chain
The first step in naming any organic compound is to identify the longest continuous carbon chain. The name `butane` suggests that the student initially considered a four-carbon chain. However, upon closer inspection, we find that the compound actually contains six carbon atoms in a straight chain.

### Step 2: Number the Carbon Chain
Once the longest chain is identified, we need to number the carbon atoms in the chain. The numbering should start from the end of the chain that gives the substituents (ethyl groups, in this case) the lowest possible numbers.

### Step 3: Identify and Name the Substituents
In the compound, the student mentioned `2,3`-diethyl, which implies that there are ethyl groups on the second and third carbons of the butane chain. However, with the correct longest chain being hexane, we need to look for substituents on the newly identified chain.

### Step 4: Determine the Correct Substituent Positions
After numbering the longest chain, we find that there are actually methyl groups on the third and fourth carbons of the six-carbon chain (hexane). Therefore, the correct substituents are `3,4-dimethyl`.

### Step 5: Combine the Information to Form the Correct IUPAC Name
Now that we have identified the longest chain as hexane and the substituents as `3,4-dimethyl`, we can combine this information to form the correct IUPAC name.

Thus, the correct IUPAC name for the compound is **3,4-dimethylhexane**.

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