Question

What happens when dihydrogen reacts with halogens?

Answer 1

i. Dihydrogen reacts with halogens (X₂) to give the corresponding hydrogen halides (HX).

(Where, X = F, Cl, Br, I)

ii. Dihydrogen reacts with fluorine to form hydrogen fluoride even at very low temperature (-250°C) in dark.

iii. However, the reaction with iodine requires a catalyst as the vigour of reaction of dihydrogen decreases with increasing atomic number of halogen.