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-Bromopropan-2-ol

Explanation

To determine which of the given molecules is chiral, we need to follow a systematic approach. Here’s a step-by-step solution:

### Step 1: Understand the Definition of Chirality
A molecule is considered chiral if its mirror image is non-superimposable on itself. This typically occurs when a carbon atom (or another atom) is attached to four different groups.

**Hint:** Remember that chirality is about the arrangement of atoms around a central atom, usually carbon.

### Step 2: Identify the Criteria for Chirality
1. The molecule must have at least one sp³ hybridized carbon atom.
2. The carbon must be bonded to four different substituents (groups).
3. The molecule must not have any plane of symmetry or center of symmetry.

**Hint:** Look for sp³ hybridized carbons and check the groups attached to them.

### Step 3: Analyze Each Given Option
We will analyze the chirality of each molecule provided in the options.

#### Option A: 1-Bromobutane
- Structure: CH₃-CH₂-CH₂-CH(Br)-H
- The carbon attached to Br is bonded to four different groups: CH₃, CH₂, CH₂, and H.
- There is no plane of symmetry.

**Conclusion:** This molecule is chiral.

#### Option B: 1-Bromobutane (again)
- This is the same as Option A, so the analysis is identical.

**Conclusion:** This molecule is also chiral.

#### Option C: 2-Bromopropane
- Structure: CH₃-CH(Br)-CH₃
- The carbon attached to Br is bonded to two identical CH₃ groups and one H.
- There is a plane of symmetry through the middle.

**Conclusion:** This molecule is not chiral.

#### Option D: 2-Bromopropane (again)
- This is the same as Option C, so the analysis is identical.

**Conclusion:** This molecule is also not chiral.

### Step 4: Final Conclusion
After analyzing all the options, we find that the only chiral molecule is **Option A: 1-Bromobutane**.

**Final Answer:** The chiral molecule is **Option A: 1-Bromobutane**.

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