Provide two simple chemical tests that will differentiate acetaldehyde and acetic acid.

• A. 1) pH test: acetaldehyde is strongly basic (pH < 7), while acetic acid is acidic (pH > 7)2) Tollens' test: acetaldehyde does not react, while acetic acid reacts with Tollens' reagent to produce a silver precipitate
• B. 1) pH test: acetaldehyde is relatively neutral (pH ≈ 7), while acetic acid is acidic (pH > 7)2) Tollens' test: acetaldehyde does not react, while acetic acid reacts with Tollens' reagent to produce a silver precipitate
• C. 1) pH test: acetaldehyde is strongly basic (pH > 7), while acetic acid is acidic (pH < 7)2) Tollens' test: acetaldehyde reacts with Tollens' reagent to produce a silver precipitate, while acetic acid does not react
• D. 1) pH test: acetaldehyde is relatively neutral (pH ≈ 7), while acetic acid is acidic (pH < 7)2) Tollens' test: acetaldehyde reacts with Tollens' reagent to produce a silver precipitate, while acetic acid does not react

Answer: (D)