Q.

Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar?

A. Butanoic acid
B. Methanoic acid
C. Ethanoic acid
D. Hexanoic acid
Answer» C. Ethanoic acid
Explanation: When ethanol reacts with oxygen it forms a weak acid called ethanoic acid. In an open bottle of beer or wine, the reaction happens naturally in the presence of bacteria, and it is the ethanoic acid that can make beer or wine taste sour.
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