The number of isomeric sodium salt that will be required to obtain neopentane is

Options

A. 3
B. 1
C. 4
D. 6

Explanation

To determine the number of isomeric sodium salts required to obtain neopentane, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Neopentane**:
Neopentane is a branched alkane with the molecular formula C5H12. Its structure can be represented as:
```
CH3
|
CH3 - C - CH3
|
CH3
```

2. **Determine the Sodium Salt Structure**:
To synthesize neopentane, we need to consider the sodium salt of a carboxylic acid that can lead to neopentane upon decarboxylation. The sodium salt can be represented as:
```
CH3C(CH3)2COO^- Na^+
```
This is the sodium salt of 2-methylbutanoic acid.

3. **Identify Possible Isomers**:
The carboxylic acid that corresponds to the sodium salt can have different structural isomers. The possible isomers of carboxylic acids with the formula C5H10O2 are:
- 2-Methylbutanoic acid
- 3-Methylbutanoic acid
- Pentanoic acid
- 2,2-Dimethylbutanoic acid
- 2,3-Dimethylbutanoic acid

4. **Count the Isomeric Sodium Salts**:
Each of these isomers can form a sodium salt. Therefore, we can conclude that there are several isomeric sodium salts that can be used to synthesize neopentane. However, we need to focus on the ones that can lead to the formation of neopentane specifically.

5. **Final Count**:
After analyzing the isomers, we find that only one specific isomeric sodium salt (the sodium salt of 2-methylbutanoic acid) will directly lead to the formation of neopentane.

Thus, the number of isomeric sodium salts required to obtain neopentane is **1**.