Question

Which of the following are aromatic? 

• A. A, B & D
• B. B & C
• C. B, C & D
• D. A, B & C

Hint:

Aromatic compounds must have a conjugated system of alternating bonds and satisfy Hückel's rule for aromaticity.

Answer 1

The Correct Option is C

 

Step 1: Aromaticity Conditions. 
For a compound to be aromatic, it must satisfy Hückel's rule, which states that a molecule is aromatic if it has a planar ring structure with \( 4n + 2 \) π-electrons (where \(n\) is a non-negative integer).

Step 2: Analyze Each Compound. 
- (A) This compound is not aromatic because it has 6 π-electrons (a common number for aromatic systems), but the ring is not planar, so it is not aromatic. 
- (B) This compound has a nitrogen atom and a conjugated system, making it aromatic. 
- (C) This compound contains a 6-membered ring with alternating single and double bonds, fitting the requirements for aromaticity with 6 π-electrons. 
- (D) This compound has a conjugated system and satisfies the aromaticity condition with 6 π-electrons. 
 

Step 3: Conclusion. 
Thus, the aromatic compounds are (B), (C), and (D). The correct answer is (3). 
 

Final Answer: \[ \boxed{\text{(3) B, C \& D}} \]