Among the following halogens $\mathrm{F}_{2}, \mathrm{Cl}_{2}, \mathrm{Br}_{2}$ and $\mathrm{I}_{2}$ Which can undergo disproportionation reaction?

(B) $\mathrm{Cl}_{2}, \mathrm{Br}_{2}$ and $\mathrm{I}_{2}$

(C) $\mathrm{F}_{2}, \mathrm{Cl}_{2}$ and $\mathrm{Br}_{2}$

(D) $\mathrm{F}_{2}$ and $\mathrm{Cl}_{2}$

JEE Main · 2024 · 08 Apr 2024 · Shift 1 · p-Block Elements

Among the following halogens

F_{2}, Cl_{2}, Br_{2}

and

I_{2}

Which can undergo disproportionation reaction?

(A)Only $I_{2}$
(B) $Cl_{2}, Br_{2}$ and $I_{2}$ ✓ Correct
(C) $F_{2}, Cl_{2}$ and $Br_{2}$
(D) $F_{2}$ and $Cl_{2}$

Answer: (B)

Solution

Disproportionation needs an element that can go both up and down in oxidation state.

F

has no positive oxidation state, so

F_{2}

cannot disproportionate;

C l_{2}, B r_{2}, I_{2}

all do (e.g. with hot alkali). Option (2).

JEE Main · 2024 · 08 Apr 2024 · Shift 1 · Single correct option

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