Which of the following pairs has the same bond angle

Options

A. Ethane and ethylene
B. Ethylene and acetylene
C. Ethylene and benzene
D. Acetylene and benzene

Explanation

To determine which pair of compounds has the same bond angle, we need to analyze the molecular structures and hybridization of the given compounds.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- The pairs given are:
1. Ethane (C2H6) and Ethylene (C2H4)
2. Ethylene (C2H4) and Benzene (C6H6)

2. **Analyze Ethane (C2H6)**:
- Ethane has a tetrahedral geometry due to sp³ hybridization of the carbon atoms.
- The bond angle in ethane is approximately **109.5 degrees**.

3. **Analyze Ethylene (C2H4)**:
- Ethylene has a planar structure due to sp² hybridization of the carbon atoms.
- The bond angle in ethylene is **120 degrees**.

4. **Analyze Benzene (C6H6)**:
- Benzene also has a planar structure with sp² hybridization for the carbon atoms.
- The bond angle in benzene is also **120 degrees**.

5. **Compare the Bond Angles**:
- From the analysis:
- Ethane: 109.5 degrees
- Ethylene: 120 degrees
- Benzene: 120 degrees
- Therefore, ethylene and benzene have the same bond angle of **120 degrees**.

### Conclusion:
The pair that has the same bond angle is **Ethylene (C2H4) and Benzene (C6H6)**, both having a bond angle of **120 degrees**.