Which compound is an aldehyde?

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Multiple Choice

Which compound is an aldehyde?

Aldehydes are defined by a carbonyl group bonded to at least one hydrogen, giving the formyl group -CHO and placing the carbonyl at the end of the carbon chain. The aldehyde form is typically named with the -al ending, as in ethanal for CH3CHO. Among the listed compounds, the one containing the -CHO form is acetaldehyde, which has the structure CH3-CHO. The others do not have an aldehyde group: acetone is a ketone with a carbonyl between two carbons, ethanol is an alcohol with an -OH group, and ethyl acetate is an ester with a -COO- linkage.

Aldehydes are defined by a carbonyl group bonded to at least one hydrogen, giving the formyl group -CHO and placing the carbonyl at the end of the carbon chain. The aldehyde form is typically named with the -al ending, as in ethanal for CH3CHO. Among the listed compounds, the one containing the -CHO form is acetaldehyde, which has the structure CH3-CHO. The others do not have an aldehyde group: acetone is a ketone with a carbonyl between two carbons, ethanol is an alcohol with an -OH group, and ethyl acetate is an ester with a -COO- linkage.

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