Tests for Functional Groups 0.0 / 5 ? ChemistryFunctional GroupsA2/A-levelOCR Created by: freyasellersCreated on: 01-06-18 15:11 Alkenes Alkenes decolourise bromine water. 1 of 7 Haloalkanes Silver nitrate - chloroalkanes form a white precipitate, bromoalkanes cream precipitate, iodoalkanes pale yellow. 2 of 7 Phenols Sodium hydroxide will dissolved in phenols and the solution will not effervesce on addition of a carbonate. 3 of 7 Carboxylic acids Effervescence with sodium carbonate - the gas is CO2 which will turn limewater cloudy. 4 of 7 Carbonyl groups (aldehydes and ketones) Forms an orange precipitate with 2,4-DNPH 5 of 7 Aldehydes Forms a silver mirror with Tollens' reagent - sodium hydroxide solution and dilute ammonia solution in a hot water bath. 6 of 7 Primary and secondary alcohols Solution turns from orange to green with acidified potassium dicromate. 7 of 7
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