Which one of the following reactions doses not take place ?

Options

A. `F_(2)+2Br rarr 2F+Br_(2)`
B. `Br_(2)+2I rarr 2Br+I_(2)`
C. `CI_(2)+2Br rarr 2CI+Br_(2)`
D. `Br_(2)+2CI rarr2Br+CI_(2)`

Answer

D

Explanation

The reaction `Br_(2)+2CI^(-) rarr 2Br^(-)+ CI_(2)` does not take place as the `E_("red")^(@)` of the above reaction is comes out to be negative. Thus the reaction is comes out be negative . Thus the reaction is non-spontaneous . Half cell reaction are given as
At cathode `Br_(2)+2e^(-) rarr 2Br^(-), E_(Br_(2)//Br^(-))^(@)=1.09V`
`2CI^(-)rarrCI_(2)+2e^(-),E_(CI_(2)//CI^(-))^(@)=1.36V`
`:. E_("red")^(@)=E_("cathode")^(@)-E_("anode")^(@) implies (1.09-1.36)V implies -0.27V`
But the `E_("red")^(@)` values of other reaction are comes out to be positive. Thus the all other reaction can take place.