Testing for carbonyls - A-Level Chemistry

In this lesson, we cover chapter 26.2 of the A Level OCR A specification. 
You should learn how to identify aldehydes and ketones through practical testing. 
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Answers to the Quick Quiz:
1. Add 2,4-DNP. If a carbonyl compound is present, an orange precipitate should form. 
2. Add Tollens' reagent and warm. Propanal should form a silver mirror precipitate. 
3. Recrystallise the precipitate and test to find the melting point. Compare values to data book values to find the specific compound. 
4. Propanal + [O] = Propanoic acid. 
CH3CH2CHO + [O] = CH3CH2COOH