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Which of the following species shows the highest reactivity?

1. I2
2. ICl
3. Cl2
4. Br2

Correct answer: ICl

Solution

ICl is more reactive than the other species because it is a polar molecule with a significant dipole moment, which allows it to engage in more vigorous reactions compared to the nonpolar diatomic molecules like I2, Cl2, and Br2.

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