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>`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 :Reactivity decreases down the group.


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