Question

Which acid is present in vinegar?

• A. Formic acid
• B. Acetic acid
• C. Citric acid
• D. Malic acid

Hint:

Remember common natural sources of acids: - Vinegar → Acetic acid - Lemon → Citric acid - Ant sting → Formic acid - Apple → Malic acid

Answer 1

The Correct Option is B

Step 1: Understanding the composition of vinegar
Vinegar is a liquid that results from the fermentation of ethanol. This process is carried out by bacteria known as \textit{Acetobacter}, which oxidize ethanol into acetic acid.
Thus, the main acidic component of vinegar is acetic acid. Step 2: Chemical formula of acetic acid
The chemical formula of acetic acid is:
$$ \text{CH}_3\text{COOH} $$ This weak acid gives vinegar its distinct sour taste and sharp odor. Step 3: Analyzing the other options
Let’s examine why the other choices are incorrect: Formic acid ($ \text{HCOOH} $): Found in ant secretions and some insect bites, not in vinegar.
Citric acid: Present in citrus fruits like lemons and oranges, not in vinegar.
Malic acid: Found in apples and other fruits, also not a primary constituent of vinegar. None of these acids are produced during the fermentation of ethanol to form vinegar. Step 4: Conclusion Since acetic acid is the principal organic acid in vinegar, the correct answer is: (2) Acetic acid