Final answer:
The missing type of alcohol from the list including beer and liquor is wine. Ethanol, also called ethyl alcohol, is present in these drinks and classified as a depressant.
Step-by-step explanation:
The common type of alcohol missing from the list provided in the question – beer, liquor, and _____ – is wine. Before the Middle Ages, the main alcoholic beverages in Europe were beer and wine. The production of spirits like gin, vodka, and whisky, which fall under the category of liquor, became widespread in the 15th century. Ethanol, or ethyl alcohol, is the type of alcohol commonly found in these beverages and is in a class of psychoactive drugs known as depressants. In addition to being consumed in alcoholic beverages, alcohol comes in several forms for various uses, including methyl alcohol as a solvent, ethylene glycol in antifreeze, and isopropyl alcohol in rubbing alcohol.