Carbon compound

ENOL

This reactive intermediate often appears when aldehydes or ketones lose a hydrogen and gain a double bond next to a hydroxyl group.

ENOL" is a type of carbon compound where an alcohol group (-OH) is directly bonded to a carbon atom that’s also double-bonded to another carbon (a C=C bond). The name blends "ene" (for the alkene part) and "ol" (for the alcohol part), making it a straightforward chemical term. In crosswords, it’s a common short answer for clues about organic molecules with both a double bond and a hydroxyl group.