Question

Which reaction is not feasible?

(a) 2KI + Br₂ → 2KBr + I₂

(b) 2KBr + I₂ → 2Kl + Br₂

(c) 2KBr + Cl₂ → 2KCI + Br₂

(d) 2H₂O + 2F₂ → 4HF + O₂

Answer 1

The correct option is: (b) 2KBr + I₂ → 2Kl + Br₂

Explanation:

The halogen are highly electronegative elements - their non-metallic character gradually decreases from fluorine to iodine. F > Cl > Br > I. Fluorine can displace chlorine, bromine and iodine. Chlorine can displace bromine and iodine and bromine can displace iodine from their salts. Iodine cannot displace flourine, chlorine and bromine. Hence reaction (b) is not feasible.