In aldehydes, the carbonyl group has a hydrogen atom attached to it together with either:

a second hydrogen atom or, more commonly, a hydrocarbon group which might be an alkyl group or one containing a benzene ring

a third hydrogen atom with another R group

one hydrogen atom with two R groups

Which statement is true?

An aldehyde differs from a ketone by having a hydrogen atom attached to the carbonyl group. This makes the aldehydes very easy to oxidise.

An aldehyde and a ketone are very similar and act in the same way when you try to oxidise them

Ketones have that hydrogen atom and are not resistant to oxidation.

usually more reactive toward nucleophilic substitutions than ketones because of both steric and electronic effects.

Quiz

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1In aldehydes, the carbonyl group has a hydrogen atom attached to it together with either:
1. Aa second hydrogen atom or, more commonly, a hydrocarbon group which might be an alkyl group or one containing a benzene ring
2. Ba third hydrogen atom with another R group
3. Cone hydrogen atom with two R groups
2How do you make aldehydes?
1. Aby oxidising primary alcohols
2. Bby a reflux experiment
3. CBy heating up a ketone
3Which is an aldehyde?
1. A
2. B
3. C
4Are aldehydes soluble?
1. AYes
2. BNo
3. COnly short chain aldehydes
5Which statement is true?
1. AAn aldehyde differs from a ketone by having a hydrogen atom attached to the carbonyl group. This makes the aldehydes very easy to oxidise.
2. BAn aldehyde and a ketone are very similar and act in the same way when you try to oxidise them
3. CKetones have that hydrogen atom and are not resistant to oxidation.
6Aldehydes are...
1. Ausually more reactive toward nucleophilic substitutions than ketones because of both steric and electronic effects.
2. Batomically extremely heavy
3. Cdo not oxidise