The `IUPAC` name of neopentane is

Options

A. 2-methylbutane
B. 2, 2-dimethylpropane
C. 2-methylpropane
D. 2, 2-dimethylbutane

Answer

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

### Step 1: Understand the structure of neopentane
Neopentane is a branched alkane. Its common structure consists of a central carbon atom bonded to four other carbon atoms, forming a tetrahedral shape.

### Step 2: Draw the structure
The structure of neopentane can be represented as follows:
```
CH3
|
CH3 - C - CH3
|
CH3
```
This shows that there are five carbon atoms in total.

### Step 3: Identify the longest carbon chain
In the case of neopentane, the longest continuous carbon chain consists of three carbon atoms.

### Step 4: Number the carbon chain
We can number the carbon chain from either end, but we will choose to number from left to right:
1. C1 (CH3)
2. C2 (central carbon with two methyl groups)
3. C3 (CH3)

### Step 5: Identify substituents
At carbon 2, there are two methyl (CH3) groups attached.

### Step 6: Write the substituent names
Since there are two methyl groups at position 2, we denote this as "2,2-dimethyl".

### Step 7: Determine the root name
The longest chain has three carbon atoms, which corresponds to the root name "prop".

### Step 8: Combine the substituent and root names
Putting it all together, we have:
- Substituents: 2,2-dimethyl
- Root name: propane

### Step 9: Finalize the IUPAC name
Thus, the complete IUPAC name for neopentane is **2,2-dimethylpropane**.

### Final Answer:
The IUPAC name of neopentane is **2,2-dimethylpropane**.

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