Question

# Order of reactivity of halogens towards hydrogen is:[A]${{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}$[B]${{I}_{2}}>B{{r}_{2}}>C{{l}_{2}}>{{F}_{2}}$[C]$C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}>{{F}_{2}}$[D]$B{{r}_{2}}>C{{l}_{2}}>{{F}_{2}}>{{I}_{2}}$

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Hint: Reactivity of the halogens depends on their electronegativity. Higher the electronegativity, higher will be the tendency of the halogens to protonate, thus it will have a higher reactivity towards hydrogen than other halogens.

Therefore, the correct order of reactivity of halogens towards hydrogen will be ${{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}$.