Which of the following pairs have nearly identical values of bond energy ? .

Options

A. `O_(2)` and `H_(2)`
B. `N_(2)` and `CO`
C. `F_(2)` and `I_(2)`
D. `O_(2)` and `Cl_(2)`

Answer

To determine which pairs of molecules have nearly identical values of bond energy, we will analyze the bond types and their corresponding bond energy values for each pair.

### Step-by-Step Solution:

1. **Understanding Bond Energy**:
- Bond energy is the amount of energy required to break a bond between two atoms. Generally, triple bonds have higher bond energies than double bonds, which in turn have higher bond energies than single bonds.

2. **Analyzing the Given Pairs**:
- We need to evaluate the bond energy values for each pair provided in the question.

3. **Evaluating O2 and H2**:
- O2 has a double bond (O=O) and H2 has a single bond (H-H).
- Approximate bond energy values: O2 = 498 kJ/mol, H2 = 436 kJ/mol.
- These values are not nearly identical.

4. **Evaluating N2 and CO**:
- N2 has a triple bond (N≡N) and CO has a triple bond (C≡O).
- Approximate bond energy values: N2 = 945 kJ/mol, CO = 1072 kJ/mol.
- These values are significantly different due to lone pair repulsion in CO.

5. **Evaluating F2 and I2**:
- F2 has a single bond (F-F) and I2 has a single bond (I-I).
- Approximate bond energy values: F2 = 156 kJ/mol, I2 = 151 kJ/mol.
- These values are nearly identical.

6. **Evaluating O2 and Cl2**:
- O2 has a double bond (O=O) and Cl2 has a single bond (Cl-Cl).
- Approximate bond energy values: O2 = 498 kJ/mol, Cl2 = 243 kJ/mol.
- These values are not nearly identical.

7. **Conclusion**:
- The pair with nearly identical bond energy values is **F2 and I2**.

### Final Answer:
The pair that has nearly identical values of bond energy is **F2 and I2**.