Carbon-carbon bond length is minimum in

Options

A. Ethane
B. Ethene
C. Ethyne
D. Benzene

Answer

To determine which carbon-carbon bond has the minimum bond length, we need to analyze the types of carbon-carbon bonds and their respective bond lengths.

### Step-by-Step Solution:

1. **Understanding Bond Types**:
- Carbon can form three types of bonds with other carbon atoms:
- Single bond (C-C)
- Double bond (C=C)
- Triple bond (C≡C)

2. **Bond Lengths**:
- Generally, the bond lengths decrease as the bond order increases. This means:
- C-C (single bond) has the longest bond length.
- C=C (double bond) has a shorter bond length than a single bond.
- C≡C (triple bond) has the shortest bond length.

3. **Comparing Bond Lengths**:
- The typical bond lengths are approximately:
- C-C (single bond) ≈ 1.54 Å
- C=C (double bond) ≈ 1.34 Å
- C≡C (triple bond) ≈ 1.20 Å

4. **Conclusion**:
- From the bond lengths, we can conclude that the carbon-carbon bond length is minimum in a carbon-carbon triple bond (C≡C).

5. **Final Answer**:
- Therefore, the carbon-carbon bond length is minimum in **ethyne (C2H2)**, which contains a triple bond.