02. Preparation of aldehydes and ketones from alcohols
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8 Terms
How are aldehydes prepared?
Oxidation of primary alcohol using K2Cr2O7(aq) Acidifed with H2SO4(aq)
What is the practical to prepare aldehydes and ketones?
1 - 5 drops of ethanol in tube
2 - add 2cm3 of oxidising agent
3 - warm bunsen with chemist’s twitch
4 - repeat with propanal
Draw the reaction of an aldehyde being prepared
Yes
Draw the reaction of a ketone being prepared
Yes
What is the colour change for aldehydes and ketones being successfully prepared?
Orange -> Green (Cr(VI) -> Cr3+)
What happens if aldehyde is not removed immediately?
It will oxidise to be carboxylic acid
How are ketones prepared?
Oxidation of secondary alcohols using K2Cr2O7(aq) Acidified with H2SO4(aq)
Why do ketones resist further oxidation?
Further oxidation would involve breaking a C-C bond
Note 
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