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Which of the following compounds is classified as an aldehyde?
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 contains the functional group \(\mathrm{-CHO}\), which consists of a carbonyl group (\(\mathrm{C=O}\)) bonded to at least one hydrogen atom.
Examine the first compound \(\mathrm{CH_3COCH_3}\), which has a carbonyl group bonded to two carbon atoms, indicating it is a ketone, not an aldehyde.
Look at the second compound \(\mathrm{CH_3CHO}\), which has a carbonyl group bonded to a hydrogen and a carbon, fitting the definition of an aldehyde.
Check the remaining compounds: \(\mathrm{CH_3COOH}\) is a carboxylic acid (contains \(\mathrm{-COOH}\) group), and \(\mathrm{CH_3CH_2OH}\) is an alcohol (contains \(\mathrm{-OH}\) group), so neither is an aldehyde.