Arrange the halogens F_(2), Cl_(2), Br_(2), I_(2) in order of their increasing reactivity with alkanes.

Arrange the halogens F_(2), Cl_(2), Br_(2), I_(2) in order of their in

1.	Arrange the halogens F_(2), Cl_(2), Br_(2), I_(2) in order of their increasing reactivity with alkanes.
Answer» `I_(2) LT Br_(2) lt Cl_(2) lt F_(2)` `Br_(2) lt Cl_(2) lt F_(2) lt I_(2)` `F_(2) lt Cl_(2) lt Br_(2) lt I_(2)` `Br_(2) lt I_(2) lt Cl_(2) lt F_(2)` Solution :FLUORINE is highly electronegative element. ELECTRONEGATIVITY of halogens decreases down the group. As the electronegativity of halogens decreases, reactivity with ALKANES, decreases. THEREFORE, `F_(2)` reacts vigorously and `I_(2)` reacts too slow.