Question

The correct order of reactivity of halogens is
(a) F > Cl > Br > I (b) F < Cl > Br < I
(c) F < Cl < Br < I (d) F < Cl < Br > I

Answer 1

The correct order of reactivity of halogens is

F > Cl > Br > I.

Option (A) is correct.

Explanation:

• The reactivities of the halogens decrease down the group.
• I < Br < Cl < F
• This is due to the fact that atomic radius increases in size with an increase of electronic energy levels.
• This reduces the force of attraction for valence electrons of other atoms, thereby decreasing their reactivity.
• This decrease also takes place because electronegativity decreases down a group, therefore, there is less attraction between resulting in less electron  "pulling."
• There is also a decrease in oxidizing ability down the group.

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