Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:

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Reactivity of H₂ with halogens:

| Reaction | Conditions |
|---|---|
|  | Explosive even in dark at low temp |
|  | Explosive in sunlight/UV light |
|  | Requires heating (~300°C) |
|  | Requires catalyst (Pt or Ni) + high temperature; reaction is reversible |

The reaction of  with  is the slowest and requires a catalyst because the I–I bond is weak but the reaction is endothermic and reversible.

Answer: Option (2) —

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