Which compound is an aldehyde?

Understand the Problem

The question is asking to identify which of the given compounds is an aldehyde based on their molecular structures. An aldehyde is characterized by a carbonyl group (C=O) attached to at least one hydrogen atom.

Answer

IV

The compound with an aldehyde functional group is IV.

More Information

Aldehydes contain a carbonyl group bonded to at least one hydrogen atom, differentiating them from ketones where the carbonyl group is bonded between two carbon atoms.

Tips

A common mistake is confusing aldehydes with ketones. Remember, aldehydes have the carbonyl group at the end of the molecule.

Sources

Aldehyde - Wikipedia - en.wikipedia.org
Aldehyde | Definition, Structure, Examples, & Facts - Britannica - britannica.com

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