Identify the chiral species among the following :1

Options

A.
B.
C.
D.

Answer

To identify the chiral species among the given compounds, we need to follow these steps:

### Step 1: Understand Chiral Carbons
A chiral carbon atom is one that has four different groups attached to it. If a carbon has two or more identical groups, it is not chiral.

### Step 2: Analyze Each Compound
Let's analyze each compound one by one to check for chiral carbons.

#### Compound 1:
- **Structure**: Three carbon atoms.
- **Carbon 1**: Has two hydrogen atoms (not chiral).
- **Carbon 2**: Has one hydrogen, one bromine, and two different groups (chiral).
- **Carbon 3**: Has two hydrogen atoms (not chiral).

**Conclusion**: This compound has one chiral carbon.

#### Compound 2:
- **Structure**: Similar to Compound 1.
- **Carbon 1**: Has three hydrogen atoms (not chiral).
- **Carbon 2**: Has one bromine, one hydrogen, one CH3, and a different group (chiral).
- **Carbon 3**: Has two hydrogen atoms (not chiral).

**Conclusion**: This compound also has one chiral carbon.

#### Compound 3:
- **Structure**: Four carbon atoms.
- **Carbon 1**: Has two hydrogen atoms (not chiral).
- **Carbon 2**: Has one bromine, one hydrogen, one CH2, and a different group (chiral).
- **Carbon 3**: Has two hydrogen atoms (not chiral).
- **Carbon 4**: Has one bromine, one hydrogen, one CH3, and a different group (chiral).

**Conclusion**: This compound has two chiral carbons.

#### Compound 4:
- **Structure**: Analyzing the carbon atoms.
- **Carbon 1**: Has two hydrogen atoms (not chiral).
- **Carbon 2**: Has two double bonds (not chiral).
- **Carbon 3**: Has two bromine atoms (not chiral).

**Conclusion**: This compound has no chiral carbons.

### Step 3: Compile Results
After analyzing all the compounds, we can summarize:
- **Compound 1**: 1 chiral carbon.
- **Compound 2**: 1 chiral carbon.
- **Compound 3**: 2 chiral carbons.
- **Compound 4**: 0 chiral carbons.

### Final Answer
The chiral species are found in **Compound 1, Compound 2, and Compound 3**.

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