02. Preparation of aldehydes and ketones from alcohols

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8 Terms

1
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How are aldehydes prepared?

Oxidation of primary alcohol using K2Cr2O7(aq) Acidifed with H2SO4(aq)

2
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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

3
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Draw the reaction of an aldehyde being prepared

Yes

4
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Draw the reaction of a ketone being prepared

Yes

5
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What is the colour change for aldehydes and ketones being successfully prepared?

Orange -> Green (Cr(VI) -> Cr3+)

6
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What happens if aldehyde is not removed immediately?

It will oxidise to be carboxylic acid

7
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How are ketones prepared?

Oxidation of secondary alcohols using K2Cr2O7(aq) Acidified with H2SO4(aq)

8
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Why do ketones resist further oxidation?

Further oxidation would involve breaking a C-C bond