Testing for functional groups 0.0 / 5 ? ChemistryFunctional GroupsA2/A-levelOCR Created by: mikewazowski29Created on: 22-02-19 10:36 Test for alkenes Add bromine water: If alkenes are present it should turn from red/brown to colourless 1 of 6 Testing for haloalkanes Preparation: Warm with NaOH (Aq) the accidify and add AgNO3 Idenitification: If there is a haloalkane present a precipitate will form; White precipitate indicates chlorine Cream precipitate indicates bromine Yellow precipitate indicates iodine 2 of 6 Testing for alcohol Prep: Warm with acidified pottassium dichromate (VI) Identification: Colour change from green to orange This will not happen for tertiary alcohols This will alos happen with aldehydes 3 of 6 Testing for Aldehydes Fehlings solution: (Warm) From blue solution to red precipitate if aldehyde is present Tollens' reagent: (Warm in water bath) Silver mirror should form on inside of test tube if it is present 4 of 6 Testing for phenol Add iron (III) chloride A purple colour should form - Will also from for any other phenolic OH 5 of 6 Testing for Carboxylic Acids Add sodium carbonate solution If carboxylic acids are present then bubbles of gas should form 6 of 6
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