Sulfur-nitrogen compounds hydrogen iodide

Iodine forms compounds with all elements except the noble gases, sulfur, and selenium, but only reacts indirectly with carbon, nitrogen, oxygen, and some noble metals. Ferric and cupric salts, and compounds of vanadium, chromium, and manganese in their highest oxidation status are reduced in acid solution by iodide ions, with liberation of free iodine. Iodine reacts with hydrocarbons, but equilibria are often unfavorable because hydrogen iodine is liberated, which may reduce the alkyl iodide to the hydrocarbon with formation of iodine. 

---