Cl2 (or) Br2 (or) I2 reacts with cold and dilute alkali solution to form
Halide + Halite
Halide + Hypohalite + H2O
Halide + Halate + H2O
Chlorine reacts with dilute alkali at room temperature forming chloride and hypochlorite
Cl2 + 2NaOH (cold, dil) →NaCl + NaOCl + H2O