An unknwon compound K is insoluble in water and soluble in cold, contrated H2SO4. It gives a blue-green precipitate with the chromic acid reagent. When mixed with Lucas reagent, a separate layer is formed after 5 minutes. Bromine solution is immediately decolorized when added to the unknown. What is the molecular formula, IHD, structure and name of her unkwown if its molecular weight is 86 g/mol.