When acetic acid reacts with ammonia the attacking nucleophile and the electrophilic center are:

Explanation

In the reaction between acetic acid (CH3COOH) and ammonia (NH3), the nitrogen atom in ammonia acts as the nucleophile, attacking the electrophilic carbonyl carbon of the acetic acid. The carbonyl carbon is particularly electrophilic due to the partial positive charge created by the electronegative oxygen atom. Thus, the correct answer is that the attacking nucleophile is nitrogen (N) and the electrophilic center is the carbonyl carbon (C).Option A is incorrect because it confuses the nucleophile with an oxygen atom that isn't involved in the reaction. Option B incorrectly identifies the nucleophile and also misstates the electrophilic center. Option D correctly identifies nitrogen but wrongly claims that the electrophile is the carbonyl oxygen, which does not participate in the nucleophilic attack.