Which one of the following is the correct sequence of the

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Which one of the following is the correct sequence of the given elements in the increasing order of their reactivity?

1. Iodine -Bromine- Chlorine-Fluorine
2. Bromine- Iodine- Chlorine-Fluorine
3. Bromine- Iodine- Fluorine-Chlorine
4. Iodine -Bromine- Fluorine-Chlorine

Correct Option: A

Reactivity of halogens decreases as we move down the group. i.e. fluorine is most reactive and iodine is least reactive, since there is successive increase in size, decrease in electronegativity and decrease in dissociation energy of X-X bonds.