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Separation of benzene from a mixture is isolation of benzene.
Chromium Chromium Chromium
Some chromium compounds: chromium bromides, chromium chlorides, chromium fluorides, chromium iodides, potassium dichromate, sodium chromate, chromium oxide, chromium sulfide, etc.
benzene with 2~chloropropane in presence of aluminiumchloride
Chromium is a 3d element. chromium is a metal.