The order of reactivity of halogens with Hydrogen is
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a
F2 < Cl2 < Br2 < I2
b
F2> Cl2 > Br2 > I2
c
F2 < Br2 < Cl2 < I2
d
F2 > I2 > Br2 > Cl2
answer is B.
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Detailed Solution
The reactivity of halogens with H2 decreases from F2 to I2. F2 reacts violently even in dark with hydrogen.The reaction of Cl2 is slow in dark but fast in sunlight.The reaction of Br2 requires temperature.The reaction of I2 is reversible and require high T and Pt catalyst.