Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?

Options

A. 2-Bromobutane
B. 1-Bromobutane
C. 2-Bromopropane
D. 2-Bromopropane-2-ol

Explanation

To determine which of the given molecules is chiral, we need to identify if there is a chiral center (chiral carbon) present in each molecule. A chiral center is a carbon atom that is bonded to four different groups. If a molecule has a chiral center, its mirror image cannot be superimposed on it, making it chiral.

### Step-by-Step Solution:

1. **Identify the Molecules**: We need to analyze the given molecules:
- A) 2-bromobutane
- B) 1-bromobutane
- C) 2-bromopropane
- D) 2-bromopropane-2-ol

2. **Check for Chiral Centers**: We will examine each molecule for the presence of a chiral center.

**A) 2-bromobutane**:
- Structure: CH3-CHBr-CH2-CH3
- The carbon atom at the second position (attached to Br) has four different groups:
- Methyl group (CH3)
- Ethyl group (CH2-CH3)
- Bromine (Br)
- Hydrogen (H)
- Since all four groups are different, 2-bromobutane has a chiral center and is therefore chiral.

**B) 1-bromobutane**:
- Structure: CH3-CH2-CH2-CH2Br
- The carbon atom at the first position (attached to Br) has:
- Bromine (Br)
- Two hydrogen atoms (H)
- Ethyl group (CH2-CH2)
- Since there are two hydrogen atoms, this carbon does not have four different groups. Therefore, it is not chiral.

**C) 2-bromopropane**:
- Structure: CH3-CHBr-CH3
- The carbon atom at the second position has:
- Two methyl groups (CH3)
- Bromine (Br)
- Hydrogen (H)
- Since there are two identical methyl groups, this carbon does not have four different groups. Therefore, it is not chiral.

**D) 2-bromopropane-2-ol**:
- Structure: CH3-C(Br)(OH)-CH3
- The carbon atom at the second position has:
- Two methyl groups (CH3)
- Bromine (Br)
- Hydroxyl group (OH)
- Again, since there are two identical methyl groups, this carbon does not have four different groups. Therefore, it is not chiral.

3. **Conclusion**: After analyzing all the molecules, we find that only **2-bromobutane** has a chiral center and is chiral in nature.

### Final Answer:
The chiral molecule among the options is **A) 2-bromobutane**.