The amount of power needed to rupture a covalent link between two atoms is known as bond energy. If a bond has a high bond energy, it is likely to be strong, and the molecule it is in will likely be stable and less reactive. Bonds in more reactive substances will often have lower bond energies.
The link between I and Cl is slightly ionic because I and Cl have different electronegativities. The connection is less strong than its covalent counterpart due to its ionic composition. A weaker bond is thought to be more reactive than a fully covalent bond since it can be broken more easily.
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