By the reaction of Hydrochloric acid and Manganese dioxide.
2HCl + MnO2 --> MnCl2 + H2O + [O]
2HCl + [O] --> H2O+ Cl2
4HCl +MnO2-->MnCl2+ 2H2O +Cl2
Halogens have high electron affinity thus, they easily react with other elements to form compounds. They are just short of one electron to attain stable electronic configuration. Hence, there are not found in a free state in nature.
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