How can you prepare `Cl_2` from HCl and HCI from `Cl_2`? Write reactions only.

Explanation

(i) `Cl_(2)` can be prepared from HCl by Deacon’s process.
`4HCl + O_(2) overset(CuCl_(2)) to 2Cl_(2) + 2H_(2)O`
(ii) HCl can be prepared from `Cl_(2)` on treating it with water.
`Cl_(2) + H_(2)O to underset("Hydrochloric acid")(HCl) + underset("Hypochlorous acid")(HCOl)`