UPSC CDS I 2024 GK Paper

Concept:Vinegar is a dilute solution of acetic acid ($\mathrm{CH_3COOH}$) in water, typically at 5-8% concentration.Explanation:Vinegar is produced by the fermentation of ethanol by acetic acid bacteria ($\mathrm{Acetobacter}$).The bacteria oxidize ethanol to acetic acid, giving a sour taste.The standard culinary vinegar contains 5-8% acetic acid by volume in water.Option A correctly describes this composition.Option B (carbonic acid) is found in carbonated drinks, not in vinegar.Option C (ethanol) is the starting material before fermentation.Option D (propionic acid) is used as a preservative in baked goods.Thus, only Option A matches the definition of vinegar.Answer:Option A: 5-8% solution of acetic acid in water.