Among the following halogens, Which can undergo disproportionation reactions?

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Solution

Q.
Among the following halogens

$F_{2}, {Cl}_{2}, {Br}_{2}$ and $I_{2}$

Which can undergo disproportionation reactions [2024]

1 Only $I_{2}$

2 ${Cl}_{2}, {Br}_{2}$ and $I_{2}$

3 $F_{2}$ and ${Cl}_{2}$

4 $F_{2}, {Cl}_{2}$ and ${Br}_{2}$

Ans.
(2)

${Cl}_{2}, {Br}_{2}$ and $I_{2}$ undergoes disproportionation reaction. For example in hot and conc. alkali disproportionate to -1 and +5 oxidation state.

$3 X_{2} + 6 {OH}^{-} \to 5 X^{-} + {XO}_{3}^{-} + 3 H_{2} O$ $(X = Cl, Br, I)$

F cannot show positive oxidation state, hence it cannot undergo disproportionation. $F_{2}$ can only get reduced to $F^{-}$ .

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