Dihydrogen reacts with halogens to form hydrogen halides (). Which of the following sequences correctly reflects the required reaction conditions corresponding to the reactivity order ?

Question

Dihydrogen reacts with halogens to form hydrogen halides ($HX$). Which of the following sequences correctly reflects the required reaction conditions corresponding to the reactivity order $F_2 > Cl_2 > Br_2 > I_2$?

Prashant Kotian · Accepted Answer

Correct answer: B. Fluorine is so reactive it reacts explosively with 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 ().

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