Which of the following reactions requires high temperature and catalyst?
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a
H2 + F2 → 2HF
b
H2 + Cl2 → 2HCl
c
H2 + Br2 → 2HBr
d
H2 + I2 → 2HI
answer is D.
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Detailed Solution
Reactivity order of halogens with hydrogens:F2 > Cl2 > Br2 > I2F2 reacts with H2 even in dark, but I2 reacts with H2 in the presence of "Pt" catalyst and at 713KH2 + X2 → 2HX