How many chiral compounds are possible on mono chlorination of 2-methyl butane ?

Options

A. 2
B. 4
C. 6
D. 8

Explanation

To determine how many chiral compounds are possible from the monochlorination of 2-methylbutane, we can follow these steps:

### Step 1: Understand the Structure of 2-Methylbutane
2-Methylbutane has the following structure:
```
CH3
|
CH3-CH-CH2-CH3
|
CH2
```
This structure consists of a butane chain with a methyl group attached to the second carbon.

### Step 2: Identify Possible Monochlorination Sites
Monochlorination involves replacing one hydrogen atom with a chlorine atom. We need to identify the different positions where chlorination can occur:
1. Chlorination at the terminal carbon (C1)
2. Chlorination at the second carbon (C2)
3. Chlorination at the third carbon (C3)
4. Chlorination at the fourth carbon (C4)

### Step 3: Draw the Monochloro Derivatives
1. **Chlorination at C1**:
- Structure: CH3-CH2-CH(CH2Cl)-CH3
- This compound is not chiral because the carbon at C1 has two identical hydrogen atoms.

2. **Chlorination at C2**:
- Structure: CH3-CH(Cl)-CH2-CH3
- This compound is chiral because the carbon at C2 has four different groups: Cl, CH3, CH2, and H.

3. **Chlorination at C3**:
- Structure: CH3-CH2-CH(Cl)-CH3
- This compound is not chiral because the carbon at C3 has two identical methyl groups.

4. **Chlorination at C4**:
- Structure: CH3-CH2-CH2-CH(Cl)
- This compound is chiral because the carbon at C4 has four different groups: Cl, CH3, CH2, and H.

### Step 4: Identify Chiral Compounds
From the above analysis, we find that the chiral compounds from monochlorination of 2-methylbutane are:
1. Chlorination at C2 (chiral)
2. Chlorination at C4 (chiral)

### Conclusion
Thus, the total number of chiral compounds possible from the monochlorination of 2-methylbutane is **2**.

### Final Answer
**2 chiral compounds are possible.**

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