Total number of primary carbon in neo-pentane is :-

Options

A. 1
B. 3
C. 2
D. 4

Answer

To determine the total number of primary carbons in neo-pentane, we can follow these steps:

### Step 1: Understand the structure of neo-pentane
Neo-pentane is a branched alkane with the molecular formula C5H12. It consists of five carbon atoms arranged in a specific way.

### Step 2: Draw the structure of neo-pentane
The structural formula of neo-pentane can be represented as follows:
```
CH3
|
CH3 - C - CH3
|
CH3
```
In this structure, there is one central carbon atom (C) bonded to four methyl groups (CH3).

### Step 3: Identify primary carbons
Primary carbons are defined as carbon atoms that are attached to only one other carbon atom.

### Step 4: Analyze each carbon in the structure
- The central carbon atom is attached to four other carbons (not primary).
- Each of the four outer carbon atoms (the CH3 groups) is attached to only one carbon atom (the central carbon).

### Step 5: Count the primary carbons
From the analysis:
- The four outer carbon atoms (CH3) are primary carbons.
- The central carbon is not a primary carbon.

Thus, the total number of primary carbons in neo-pentane is **4**.

### Conclusion
The answer to the question is that the total number of primary carbons in neo-pentane is **4**.