Final Answer:
The ester is identified as salicylic acid when the product is cooled and acidified with concentrated HCl. Option D is answer.
Step-by-step explanation:
The given chemical transformation involves the reaction of an ester with hydrochloric acid (HCl) resulting in the formation of an acid and other products. The specific ester in this reaction is not mentioned, but the emergence of a white crystalline acid upon cooling and acidification indicates the production of salicylic acid.
Salicylic acid is a well-known aromatic acid with the molecular formula C7H6O3. It is commonly used in the synthesis of aspirin and is recognizable by its white crystalline appearance. The reaction described suggests the hydrolysis of an ester to yield salicylic acid, which is consistent with the observed crystalline acid formed.
Therefore, the correct answer is Option D: Salicylic acid.