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  4. Fluorine is the most reactive among all the halogens, because of its

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Q. Fluorine is the most reactive among all the halogens, because of its

Classification of Elements and Periodicity in Properties

Solution:

Fluorine is the most reactive among all the halogens, because of it's low dissociation energy of $F - F$ bond. The dissociation energies $( kcal / mol )$ in $F _{2}, Cl _{2}, Br _{2}$ and $I _{2}$ are $38,57,45.5$ and $35.6$ respectively.
In the case of fluorine:
(a) short bond length and larger repulsion between non-bonding electrons lead to low dissociation energy.
(b) absence of multiple bonding leads to low dissociation energy.