Question

Which of the following compounds are aromatic?

• A. A, B
• B. A, B, C
• C. B, C
• D. B, C, D
• E. A, B, D

Answer 1

Answer: (A)

Structure (a) has two $\pi$ -bonds and one lone pair of electrons over $N$ -atom and has planer structure.

Thus, is an aromatic compound.



(b) The structure (b) also contain two $\pi$ -bonds and one lone pair of electrons. Thus, follow Huckel' s rule. The structure is cyclic and planer.

$\therefore$ (b) is also an aromatic compound.



(c) The structure (c) has only $2\pi$ -bonds and do not follow Huckel' s rule. So, it not an aromatic compound.



(d) Structure (d) also contain only two $\pi$ -bonds, thus do not follow Huckel' s rule and is not an aromatic compound.