Question

Acetophenone and Benzaldehyde can be distinguished by:
(A) Tollen's reagent
(B) DNP test
(C) Iodoform test
(D) Carbylamine test
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (A) and (C) only
• C. (A) and (B) only
• D. (B) and (D) only

Hint:

Tollens’ reagent distinguishes aldehyde vs ketone; Iodoform test distinguishes methyl ketones.

Answer 1

The Correct Option is B

Step 1: Review the diagnostic tests.
- Tollens’ test: Benzaldehyde (aldehyde) yields a silver mirror; acetophenone (ketone) does not.
- DNP test: Aldehydes and ketones both give a positive 2,4-DNP test (orange/yellow precipitate), thus it's not distinguishing.
- Iodoform test: Acetophenone (methyl ketone) produces a yellow precipitate of \(CHI_3\); benzaldehyde does not.
- Carbylamine test: Identifies primary amines; not applicable to aldehydes/ketones.
Step 2: Conclusion.
Therefore, Tollens' reagent and the Iodoform test differentiate acetophenone and benzaldehyde.
Final Answer: \[ \boxed{\text{(A) and (C) only}} \]