Which one of the following reactions does not occur?

Which one of the following reactions does not occur?
  1. $\mathrm{F}_2+2 \mathrm{Cl}^{-} \longrightarrow 2 \mathrm{~F}^{-}+\mathrm{Cl}_2$
  2. $\mathrm{Cl}_2+2 \mathrm{~F}^{-} \longrightarrow 2 \mathrm{Cl}^{-}+\mathrm{F}_2$
  3. $\mathrm{Br}_2+2 \mathrm{I}^{-} \longrightarrow 2 \mathrm{Br}^{-}+\mathrm{I}_2$
  4. $\mathrm{Cl}_2+2 \mathrm{Br}^{-} \longrightarrow 2 \mathrm{Cl}^{-}+\mathrm{Br}_2$

Solution

With progressive increase in atomic number, the reduction potential of halogens decreases, thus oxidising power also decreases. Hence, a halogen with lower atomic number will oxidise the halide ion of higher atomic number and therefore, will liberate them from their salt solution. Hence, the reaction $$ \mathrm{Cl}_2+2 \mathrm{~F}^{-} \longrightarrow 2 \mathrm{Cl}^{-}+\mathrm{F}_2 $$ is not possible. ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

Practice more P-BLOCK ELEMENTS GROUP 15 16 17 18 questions on Aicharya