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Arrange the halogens F(2),Cl(2),Br(2),I(...

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 Br_(2) lt I_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Rate of reaction of alkanes with halogens is `F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`
Alkane react with `F_(2)` is vigorously and with `I_(2)` the reaction is too slow that it requires a catalyst. It is because of high electronegativity of fluorine . Reactivity decreases with decrease in electronegativity and electronegativity decreases down the group
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