Chapter 15, Problem 24E

Ethene (C₂H₄) can be halogenated by this reaction:

   ${\text{C}}_{\text{2}}{\text{H}}_{\text{4}}\left(\text{g}\right)+{\text{X}}_{\text{2}}\left(\text{g}\right)\rightleftharpoons {\text{C}}_{\text{2}}{\text{H}}_{\text{4}}\text{X}\left(\text{g}\right)$
Where
X₂ can be
Cl₂ (green)
Br₂ (brown), or
I₂ (purple). Examine the three figures representing equilibrium concentrations in this reaction at the same temperature for the three different halogens. Rank the equilibrium constants for the three reactions from largest to smallest.