Which of the following is not a chiral ?

Options

A. 3-Methylhexane
B. 2, 3-Dihydroxypropanoic acid
C. 2, 3-Dibromobutane
D. Butan-2-ol

Answer

To determine which of the given compounds is not chiral, we need to understand the concept of chirality and identify the presence of chiral centers in each compound.

### Step-by-Step Solution:

1. **Understanding Chirality**:
- A molecule is chiral if it has at least one chiral center (a carbon atom bonded to four different groups).
- A chiral center typically has sp³ hybridization, which means it forms four sigma bonds.

2. **Analyzing Each Compound**:
- Let's denote the compounds as A, B, C, and D.

3. **Compound A**:
- Check for chiral centers. If it has a carbon with four different substituents, it is chiral.
- If we find that it has two identical substituents on a carbon, it is not chiral.

4. **Compound B**:
- Similarly, analyze this compound for chiral centers.
- Look for a carbon that has four different groups attached. If it has any two identical groups, it is not chiral.

5. **Compound C**:
- Follow the same procedure.
- Identify the carbon atoms and check their substituents.

6. **Compound D**:
- Again, check for chiral centers.
- If a carbon atom has two or more identical substituents, it cannot be chiral.

7. **Conclusion**:
- After analyzing all compounds, identify which one does not have any chiral centers or has identical substituents on a carbon atom.
- The compound that does not meet the criteria for chirality is the answer.

### Final Answer:
- Based on the analysis, the compound that is not chiral is **Option C**.