The reagent that can be used to distinguish acetophenone and benzophenone is _______________.

• A. 2,4-dinitrophenylhydrazine
• B. aqueous NaHS₃
• C. Benedict’s Reagent
• D. I₂ and NaOH

The reagent that can effectively distinguish between acetophenone and benzophenone is A. 2,4-dinitrophenylhydrazine. This reagent reacts with carbonyl compounds to form yellow or orange precipitates, allowing for differentiation based on the structure of the ketones.

Why 2,4-Dinitrophenylhydrazine?

This reagent specifically targets the carbonyl group present in both compounds. However, the resulting derivatives will differ in their melting points and solubility, making it easier to identify each compound.

Other Options Explained

• B. Aqueous NaHS₃: This is not selective for distinguishing between these two compounds.
• C. Benedict’s Reagent: Primarily used for reducing sugars, not suitable here.
• D. I₂ and NaOH: This combination is not effective for differentiating between acetophenone and benzophenone.

In summary, 2,4-dinitrophenylhydrazine is the best choice for distinguishing between acetophenone and benzophenone due to its specific reactivity with carbonyl groups.