What is the order of bond enthalpies of halogens? Why is it not opposite to that of bond lengths?

Explanation

To answer the question regarding the order of bond enthalpies of halogens and why it is not opposite to that of bond lengths, we can break down the solution into several steps:

### Step-by-Step Solution:

1. **Understanding Bond Lengths of Halogens**:
- The bond lengths of diatomic halogen molecules (F₂, Cl₂, Br₂, I₂) can be arranged in the following order based on increasing bond length:
- F₂ < Cl₂ < Br₂ < I₂
- This indicates that fluorine has the shortest bond length, while iodine has the longest bond length.
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