Test tube reactions for functional groups Flashcards
1
Q
How to test for alcohols?
A
Use Potassium Dichromate (K₂Cr₂O₇)
Primary and Secondary alcohols will go from orange to green.
Tertiary alcohols will stay orange - no reaction.
2
Q
How to test for aldehydes?
A
Use Tollen’s Reagent
Will produce a silver mirror if aldehyde is present.
Ketones will remain the same –> no reaction.
OR
Use Fehling’s Solution
Add a few drops of the solution + anti-bumping granules + gently heat.
Will go blue to red if aldehyde is present.
3
Q
How to test for an alkene?
A
Use Bromine Water
Solution will go orange to colourless if alkene is present.
4
Q
How to test for COOH?
A
Use sodium carbonate.
Limewater will turn cloudy if COOH is present.
Effervesence - showing presence of CO2 gas
