To determine the most reactive compound among iodine chloride (ICL), chlorine (Cl2), bromine (Br2), and iodine (I2), we can analyze their structures and properties.
### Step-by-Step Solution:
1. **Identify the Compounds**: The compounds given are iodine chloride (ICL), chlorine (Cl2), bromine (Br2), and iodine (I2).
2. **Understand Interhalogen Compounds**: Iodine chloride (ICL) is an interhalogen compound, which means it is formed from two different halogens (iodine and chlorine). Interhalogen compounds typically exhibit different properties compared to diatomic molecules of the same halogen.
3. **Electronegativity Consideration**: Iodine (I) and chlorine (Cl) have different electronegativities. Chlorine is more electronegative than iodine, which leads to a polar bond in ICL. The polarity of the bond means that there is a significant difference in electron density across the bond, making it more reactive.
4. **Nonpolar Bonds in Diatomic Molecules**: In contrast, chlorine (Cl2), bromine (Br2), and iodine (I2) are homonuclear diatomic molecules, meaning they consist of two atoms of the same element. These bonds are nonpolar because the electronegativity is the same, resulting in equal sharing of electrons. Nonpolar bonds are generally less reactive.
5. **Reactivity Comparison**: The reactivity of a compound is often influenced by the type of bonds present. Since ICL has a polar bond due to the difference in electronegativity, it is more reactive than the nonpolar bonds in Cl2, Br2, and I2.
6. **Conclusion**: Based on the analysis, iodine chloride (ICL) is the most reactive among the given options due to its polar bond and the presence of different electronegativities in its constituent atoms.
### Final Answer:
The most reactive among the following is iodine chloride (ICL).
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