Question

Arrange the halogens `F_(2),Cl_(2),Br_(2),I_(2)`, in order of their increasing reactivity with alkanes.
A. `I_(2) lt Br_(2) lt Cl_(2) lt F_(2)`
B. `Br_(2) lt Cl_(2) lt F_(2) lt I_(2)`
C. `F_(2) lt Cl_(2) lt Br_(2) lt I_(2)`
D. `Br_(2) lt I_(2) lt Cl_(2) lt F_(2)`

Answer 1

Correct Answer - A
Rate of reaction of alkanes with halogens is
`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`.
Reactivity decreases down the group as the electronegativity of the halogen decreases down the group.