Question: Arrange the halogens F2 , Cl2 , Br2 , I2 , in order of their increasing reactivity
with alkanes.
(i) I2 < Br2 < Cl2 < F2
(ii) Br2 < Cl2 < F2 < I2
(iii) F2 < Cl2 < Br2 < I2
(iv) Br2 < I2< Cl2 < F2
Solution:
Option (i) I2 < Br2 < Cl2 < F2 is the answer.