A) \[{{I}_{2}}>B{{r}_{2}}>C{{l}_{2}}>{{F}_{2}}\]
B) \[B{{r}_{2}}>{{I}_{2}}>C{{l}_{2}}>{{F}_{2}}\]
C) \[C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}>{{F}_{2}}\]
D) \[{{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}\]
Correct Answer: D
Solution :
The halogens are very reactive elements. Their high electro-negativity, high electron affinity and comparatively low bond energies account for their extreme reactivity. Fluorine is most reactive and reactivity decreases with increasing atomic number i.e. from fluorine to iodine. Thus, the correct order of reactivity is: \[{{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}\]
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