Which of the following best defines alcohol?

The definition of alcohol in this context is best captured by the option that describes it as a product of distillation of any fermented liquid, including synthetic ethyl alcohol. Alcohol, particularly ethanol, is primarily produced through the fermentation process, where sugars are converted into alcohol and carbon dioxide by yeast. However, the definition widens to include the distillation process, which separates alcohol from the fermented liquid to produce a higher concentration of alcohol.

Synthetic ethyl alcohol is also recognized as a valid form of alcohol, as it can be produced through chemical processes rather than solely relying on natural fermentation methods. This encompasses a broad range of alcohol types, covering both naturally produced and synthetically created varieties, making it an accurate and comprehensive definition.

Other options, such as those suggesting that alcohol contains no alcohol, is limited to fermentation of fruits, or is merely a natural liquid found in plants and fruits, do not capture the full scope of what alcohol can be and do not account for the distillation process or synthetic production, thereby making them less accurate definitions.