Alkenes + bromine Br2, Brown colour disappears quickly, Alkanes + bromine Br2, Brown colour disappears slowly with UV light, Alcohols + acidified dichromate (Cr2O7-2), Orange solution turns green, Alkenes + acidified permanganate (MnO4 -), Purple solution turns colourless, Carboxylic acids + litmus paper, Blue litmus turns red, Amines + litmus paper, Red litmus turns blue

Testing for Hydrocarbons - Colour Changes

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