Question

Which among the following carboxylic acids is found in Lemon?

• A. Acetic acid
• B. Citric acid
• C. Formic acid
• D. L-Lactic acid

Answer 1

The Correct Option is B

Lemons, like many other citrus fruits, are rich in organic acids, contributing to their distinct sour taste. One of the key organic acids found in lemons is citric acid. In this article, we'll take a detailed look at citric acid, its properties, and its important role in the chemistry of lemons.

What is Citric Acid?

Citric acid is a naturally occurring organic acid that is widely found in citrus fruits, including lemons, oranges, and limes. It is a weak acid with the chemical formula C₆H₈O₇ and is classified as a tricarboxylic acid because it contains three carboxyl groups (-COOH). Citric acid is often used in food and beverages for its sour taste and as a preservative.

Why is Citric Acid Found in Lemons?

Lemons are known for their tart, tangy flavor, which is primarily due to the presence of citric acid. When you taste a lemon, you're experiencing the sharp, sour sensation created by the acidity of citric acid. This acid plays a significant role in the fruit’s metabolic processes as well, such as in the citric acid cycle (Krebs cycle), which is essential for energy production in living cells.

Other Organic Acids in Lemons

While citric acid is the most abundant carboxylic acid in lemons, the fruit also contains small amounts of other organic acids, including:

Ascorbic acid (Vitamin C): A powerful antioxidant and important nutrient found in lemons.

Malic acid: Found in small quantities, contributing to the overall sour taste of the fruit.

However, citric acid remains the predominant acid responsible for the characteristic sourness of lemons.

Uses of Citric Acid

Citric acid is not only found in nature but also has numerous applications in various industries. Some common uses include:

Food and Beverages: Citric acid is widely used as a flavoring agent, preservative, and acidity regulator in soft drinks, candies, and canned goods.

Cosmetics and Cleaning Products: It is used in cosmetics for its exfoliating properties and in cleaning products as a natural descaler.

Pharmaceuticals: Citric acid is used in certain medications to adjust pH levels and as a stabilizer.

Conclusion

The carboxylic acid primarily responsible for the sour taste in lemons is citric acid. This organic acid not only contributes to the fruit's flavor but also has various uses in food, cleaning products, and even pharmaceuticals.

Thus, the correct answer is: (B) Citric acid.