Chlorine is liberated, when we heat

Heat is liberated when __ _

Heat is liberated when __ _

Carbylamine is liberated when …….is heated with chloroform and alcoholic potash

lodine is liberated in the reactions between KI and Cu^(2+) , but chlorine is not liberated when KCI is added to Cu^(2+) , why?

Iodine is liberated in the reaction between KI and CU^(2+) ions but chlorine is not liberated when KCl is added to Cu^(2+) ions. Explain.