16 organic analysis
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how do you test for an alkene?
shake with bromine water
what is the result of shaking an alkene with bromine water?
orange to colourless
how do you test for a halogenalkane?
• add NaOH (aq) and heat • acidify with HNO3 • add AgNO4
what is the result of the test for a halogenalkane?
precipitate of Ag(halogen)
how do you test for an alcohol?
add acidified K2Cr2O7
what happens when you add acidified K2Cr2O7 to an alcohol?
orange to green colour
what types of alcohols don’t react with acidified K2Cr2O7?
tertiary
what can also react with acidified K2Cr2O7 that isn’t an alcohol?
aldehyde
how do you test for aldehydes?
warm with fehling’s solution or tollen’s reagent
what happens when you warm fehling’s solution with an aldehyde?
blue colour to red precipitate
how do you test for carboxylic acids?
add NaHCO3 (aq)
what happens when you warm tollen’s reagent with an aldehyde?
silver mirror forms
what happens when you add NaHCO3 with a carboxylic acid?
effervescence