Textbook Question
What are the systematic names of the following compounds? Indicate the configuration (R or S) of each asymmetric center.
b. D-mannose
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21. Aldehydes and Ketones: Nucleophilic Addition
Naming Aldehydes
Multiple Choice
Which of the following compounds is an aldehyde?
A
B
C
D
Verified step by step guidance1
Recall the definition of an aldehyde: it is an organic compound containing a carbonyl group (C=O) bonded to at least one hydrogen atom, typically represented as \$\(\mathrm{R{-}\)CHO}\$, where R is a carbon-containing group or hydrogen.
Examine each given compound's structure to identify the functional groups present. For example, look for the carbonyl group (C=O) and check what atoms or groups are attached to the carbonyl carbon.
For the compound \$\(\mathrm{CH_3COCH_3}\)\$, recognize that the carbonyl carbon is bonded to two carbon groups (methyl groups), indicating it is a ketone, not an aldehyde.
For the compound \$\(\mathrm{CH_3COOH}\)\$, identify the carboxyl group (COOH), which characterizes a carboxylic acid, not an aldehyde.
For the compound \$\(\mathrm{CH_3CH_2OH}\)\$, note the presence of an -OH group attached to an alkyl chain, indicating it is an alcohol, not an aldehyde. The aldehyde structure is \$\(\mathrm{CH_3CHO}\)\$, where the carbonyl carbon is bonded to a hydrogen and a methyl group.
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