question_answer 51)

  Which of the following elements does not show disproportionation tendency? (a)\[\text{Cl}\]                                  (b) \[\text{Br}\]                                                (c)\[\text{F}~\]                                 (d) \[\text{I}\]

Answer:

  (c) Fluorine being most electronegative element, its oxidation   state is fixed, i.e., (-1) hence it never shows disproportionation.