Which is not an aldehyde?

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Multiple Choice

Which is not an aldehyde?

Explanation:
Aldehydes are characterized by a carbonyl group bonded to a hydrogen, the formyl group -CHO. Acetaldehyde, benzaldehyde, and formaldehyde all contain this -CHO unit in their structures, so they are aldehydes. Menthol, in contrast, has an alcohol functional group (-OH) and a hydrocarbon framework rather than the -CHO group, so it is not an aldehyde.

Aldehydes are characterized by a carbonyl group bonded to a hydrogen, the formyl group -CHO. Acetaldehyde, benzaldehyde, and formaldehyde all contain this -CHO unit in their structures, so they are aldehydes. Menthol, in contrast, has an alcohol functional group (-OH) and a hydrocarbon framework rather than the -CHO group, so it is not an aldehyde.

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