Assertion (A) : Citric acid is used in soft drinks. Reason (R) : Citric acid is a good substitution for acetic acid in soft drinks.

Assertion (A) is true as citric acid is the most widely used organic acid in the beverage industry, accounting for over 60% of all acidulants [t1]. It is favored in soft drinks for its high solubility, ability to provide a 'burst' of tartness, and its role as a preservative and chelating agent [t1][t2][t3]. However, Reason (R) is false. Acetic acid, the primary component of vinegar, possesses a strong, pungent, and sharp odor and taste [t4]. While it is an effective antimicrobial agent, its sensory profile makes it unsuitable for soft drinks, where a refreshing fruit-like acidity is desired [t2][t4]. Citric acid is chosen for its specific flavor-enhancing properties that mimic natural fruits, rather than as a 'substitution' for the pungent acetic acid, which is primarily reserved for pickling and savory applications [t2][t4].

Sources

1. [1] https://www.sciencedirect.com/topics/neuroscience/acidifier