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Which of the following compounds contains an aldehyde functional group?
A
B
C
D
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1
Identify the functional groups present in each compound by analyzing their molecular formulas and structures.
Recall that an aldehyde functional group is characterized by the presence of a carbonyl group (C=O) bonded to at least one hydrogen atom, represented as -CHO.
Examine the first compound, \(\mathrm{CH_3CHO}\), which has a carbonyl group attached to a hydrogen and a methyl group, fitting the aldehyde definition.
Check the second compound, \(\mathrm{CH_3COOH}\), which contains a carboxylic acid group (-COOH), not an aldehyde.
Review the third and fourth compounds: \(\mathrm{CH_3CH_2OH}\) contains an alcohol group (-OH), and \(\mathrm{CH_3COCH_3}\) contains a ketone group (carbonyl bonded to two carbons), neither of which are aldehydes.