2-Hydroxypropanoic acid, commonly known as lactic acid, belonging to the family of carboxylic acids, is a clear odourless water-soluble liquid, which is found in sour milk and in many fruits.
Bio-butanol or butanol fuel refers to the four-carbon alcohol produced by the fermentation of biomass. Its major application involves its use as a fuel in an internal combustion engine. It can be used as a biofuel in the future.