It's not. Absolute alcohol is 200-proof, and is readily available, if you have the license for it. In the 1970s, I ordered 25 gallons of it for the lab I worked in, and National Distillers gave it to for free, to save the paperwork; in truckload quantities, it was something like 90c per gallon.
At 1 atmosphere, fractional distillation can produce alcohol of 95.6% which would be 191.2 proof. At lower pressure, absolute alcohol can be produced.
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80 proof liquor contains 40% alcohol by volume. This means that 80 proof liquor is 40% alcohol and 60% other ingredients (usually water).
The maximum alcohol percentage depends on the type of beverage. Generally, most spirits have a maximum alcohol percentage of around 40-50%, although some specialty liquors may have higher percentages. Wine typically ranges from 12-15% alcohol, while beer usually has an alcohol content ranging from 4-8%.
180
Pure grain alcohol is typically labeled as 190-proof, meaning it contains 95% alcohol by volume. It is made through the distillation of fermented grains like corn, wheat, or barley, resulting in a highly concentrated and potent form of alcohol. Due to its high alcohol content, pure grain alcohol should be consumed in moderation and handled with caution.
Ethyl alcohol shows maximum hydrogen bonding with water because it has an additional -CH2 group compared to methyl alcohol, providing more sites for hydrogen bonding with water molecules.