The number of all type of isomers of chlorobutane is :

Options

A. 2
B. 4
C. 6
D. 5

Explanation

To determine the total number of isomers of chlorobutane, we need to consider both structural isomers and stereoisomers. Chlorobutane has the molecular formula C4H9Cl.

### Step-by-Step Solution:

1. **Identify the Structure of Butane**:
Butane (C4H10) has two structural forms: n-butane (a straight chain) and isobutane (a branched chain).

2. **Substituting Chlorine**:
We will now substitute a chlorine atom (Cl) for one hydrogen atom (H) in both structural forms of butane.

3. **Structural Isomers of Chlorobutane**:
- **n-Butyl Chloride**: Chlorine is attached to the terminal carbon of n-butane.
- **sec-Butyl Chloride**: Chlorine is attached to the second carbon of n-butane.
- **Isobutyl Chloride**: Chlorine is attached to the terminal carbon of isobutane.
- **tert-Butyl Chloride**: Chlorine is attached to the central carbon of isobutane.

4. **Stereoisomers**:
- For **sec-butyl chloride**, there is a possibility of having stereoisomers due to the presence of a chiral center. This means sec-butyl chloride can exist in two forms (enantiomers).

5. **Counting All Isomers**:
- From n-butane: 1 (n-butyl chloride)
- From sec-butane: 1 (sec-butyl chloride) + 2 (due to stereoisomerism)
- From isobutane: 1 (isobutyl chloride) + 1 (tert-butyl chloride)
- Total: 1 (n-butyl) + 3 (from sec-butyl) + 1 (isobutyl) + 1 (tert-butyl) = 6 isomers.

### Conclusion:
The total number of isomers of chlorobutane is **6**.