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

Testing for Hydrocarbons - Observations

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