Which one of the following halogens liberates oxygen, when passed through hot concentrated KOH solution?

Which one of the following halogens liberates oxygen, when passed through hot concentrated KOH solution?
  1. $\mathrm{I}_2$
  2. $\mathrm{Cl}_2$
  3. $\mathrm{Br}_2$
  4. $\mathrm{F}_2$

Solution

$\underset{\text { Fluorine }}{2 \mathrm{~F}_2}+\underset{\text { hot and conc }}{4 \mathrm{KOH}} \longrightarrow 4 \mathrm{KF}+2 \mathrm{H}_2 \mathrm{O}+\underset{\text { Oxygen }}{\mathrm{O}_2}$

Asked in: AP EAMCET 2001

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