The order of reactivity of halogens with hydrogen is

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$F_{2} < C l_{2} < B r_{2} < I_{2}$

$F_{2} > C l_{2} > B r_{2} > I_{2}$

$F_{2} < B r_{2} < C l_{2} < I_{2}$

$F_{2} > B r_{2} > C l_{2} > I_{2}$

answer is B.

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Detailed Solution

The reactivity of halogens decreases with the increase in atomic number of halogens. So the correct order of reactivity of halogens is $F_{2} > C l_{2} > B r_{2} > I_{2}$

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