Dihydrogen reacts with halogens to form hydrogen halides (). Which of the following sequences correc — Hydrogen Chemistry Question

💡 Solution & Explanation

Fluorine is so reactive it reacts explosively with $H_2$ even in the dark. Chlorine requires diffused sunlight (photochemical). Bromine requires significant heating (670 K). Iodine, being the least reactive, requires both heat (670 K) and a catalyst like Platinum ($Pt$).