Which of the following does not decolourise iodine?

In (1), (3) and (4), l2 is reduced to 2I⊖ but Cl- ion cannot displace I2 but Cl2 can displace I⊖ion. (1) I2+SO32−+H2O⟶2I⊖+SO42−+2H⊕  (3) I2+2S2O32−⟶S4O62−+2I⊖  (4) I2+2OH⊖⟶IO⊙+I⊖+H2O