Which functional group is present in the following compound: ?
A
Aldehyde
B
Ketone
C
Alcohol
D
Carboxylic acid
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1
Identify the structure of the compound given: CH3-C(=O)-CH2-CH3. This means there is a carbonyl group (C=O) bonded to a carbon atom that is itself bonded to two other carbon atoms.
Recall the key functional groups involving carbonyl (C=O): aldehydes have the carbonyl at the end of the chain bonded to at least one hydrogen, ketones have the carbonyl bonded to two carbon atoms, carboxylic acids have a carbonyl bonded to an -OH group, and alcohols have an -OH group without a carbonyl.
Analyze the position of the carbonyl group in the compound: since the carbonyl carbon is bonded to two alkyl groups (CH3 and CH2CH3), it fits the definition of a ketone functional group.
Confirm that the compound does not have an -OH group attached to the carbonyl carbon, so it is not a carboxylic acid or alcohol, and the carbonyl is not at the end bonded to hydrogen, so it is not an aldehyde.
Conclude that the functional group present in the compound is a ketone.