Amongst the C-X bond the correct bond energy order is

Options

A. `C-CI gtC-Br gt C-I`
B. `C-I gt C- CI gtC-Br`
C. `C-Br gt C-CI gt C-I`
D. `C-I gt C-Br gt C-CI`

Answer

To determine the correct bond energy order among the C-X bonds (where X represents halogens such as Cl, Br, and I), we need to analyze the bond strength and bond energy based on electronegativity differences and atomic sizes.

### Step-by-Step Solution:

1. **Understanding Bond Energy**:
- Bond energy is the energy required to break a bond between two atoms. It is directly proportional to bond strength; the stronger the bond, the higher the bond energy.

**Hint**: Remember that bond energy reflects how strong the bond is between two atoms.

2. **Electronegativity and Bond Strength**:
- The bond strength is influenced by the difference in electronegativity between the two atoms involved in the bond. A greater difference in electronegativity leads to a stronger bond.

**Hint**: Consider how electronegativity affects the attraction between bonded atoms.

3. **Electronegativity Values**:
- The electronegativity values for the halogens are approximately:
- Cl (3.16) > Br (2.96) > I (2.66).
- This indicates that Cl has the highest electronegativity, followed by Br, and then I.

**Hint**: Look at the periodic table to find the electronegativity values of the halogens.

4. **Bond Energy Order Based on Electronegativity**:
- Since Cl has the highest electronegativity, the C-Cl bond will have the highest bond energy due to the significant electronegativity difference.
- The C-Br bond will have a lower bond energy than C-Cl but higher than C-I because Br has a higher electronegativity than I.
- The C-I bond will have the lowest bond energy due to the smallest electronegativity difference.

**Hint**: Compare the electronegativity differences to determine which bonds are stronger.

5. **Considering Atomic Size**:
- The size of the atoms also plays a role. Iodine is much larger than carbon, which means the overlap of orbitals in the C-I bond is less effective compared to C-Cl and C-Br bonds. This leads to a weaker bond.

**Hint**: Remember that larger atoms can lead to poorer overlap and thus weaker bonds.

6. **Final Bond Energy Order**:
- Based on the above analysis, the correct order of bond energy for C-X bonds is:
- C-Cl > C-Br > C-I.

**Hint**: Write down the bond energy order to visualize the relationship between bond strength and electronegativity.

### Conclusion:
The correct bond energy order among the C-X bonds is:
**C-Cl > C-Br > C-I**.