Organic acids are naturally occurring compounds in fruits and vegetables that contribute significantly to their flavor, particularly their tartness or sourness. Different fruits are characterized by the predominance of specific organic acids.
Step 1: Understanding the Question:
The question asks to identify the main organic acid responsible for the characteristic taste of citrus fruits.
Step 2: Detailed Explanation:
Let's identify the primary source for each of the acids listed:
(A) Acetic acid: This is the acid that gives vinegar its sour taste and pungent smell.
(B) Lactic acid: This acid is produced by bacterial fermentation and is characteristic of sour milk products like yogurt and kefir, as well as pickled vegetables.
(C) Citric acid: This acid is found in high concentrations in citrus fruits such as lemons, limes, oranges, and grapefruits. Its name is derived from this very source. It is responsible for their distinctively sharp, sour taste.
(D) Tartaric acid: This is the principal acid found in grapes and is also present in tamarinds and bananas.
Given the options, citric acid is the defining acid of citrus fruits.
Step 3: Final Answer:
The major acid present in citrus fruits is Citric acid.