Which of the following is NOT a characteristic of carboxylic acids?

Carboxylic acids are organic compounds characterized by the presence of a carboxyl group (-COOH) and exhibit several distinct properties. Among these, their reactivity with metals, carbonates, and alcohols to form esters is well documented.

While carboxylic acids do exhibit acidic properties, they are generally considered weak acids compared to strong acids like hydrochloric acid or sulfuric acid. This means they do donate protons (H⁺) in solution but not to the extent that would characterize them as strong acids. Thus, the assertion that they have strong acidic properties does not accurately reflect the nature of carboxylic acids.

Since they can react with metals, typically producing hydrogen gas, and with carbonates to release carbon dioxide, both of these reactions are characteristic features of their behavior. The ability to form esters with alcohols also fits within the reactivity profile of carboxylic acids, as this is a well-known method of synthesizing these compounds.

Therefore, the correct answer highlights the mischaracterization of the acidic strength of carboxylic acids.