Organic Functional Group Tests Flashcards
How do you test for an alcohol?
Acidified potassium dichromate
Primary alcohols turn the K2Cr2O7 from ______ to ____.
Primary alcohols turn the K2Cr2O7 from (orange) to (green).
Secondary alcohols turn the K2Cr2O7 from ______ to ____.
Secondary alcohols turn the K2Cr2O7 from (orange) to (green).
What happens to K2Cr2O7 when it is added to a tertiary alcohol?
No colour change
Remains orange
Can primary alcohols be oxidised?
Yes
From an alcohol to an aldehyde
From an aldehyde to a carboxylic acid
Can secondary alcohols be oxidised?
Yes
From an alcohol to a ketone
Can tertiary alcohols be oxidised?
No
What is the result of the Tollen’s test if an aldehyde is present?
A silver mirror forms
What is the result of the Tollen’s test if a ketone is present?
No change
What is the result of the Fehling’s test if an aldehyde is present?
Blue to brick red
What is the result of the Fehling’s test if a ketone is present?
No change
What is the test for an alkene?
Add bromine water
Goes from orange to colourless
What is the test for a carboxylic acid?
Add sodium hydrogencarbonate
Bubble through limewater
Goes cloudy as CO2 is produced
