Which of the following compounds are aromatic?

Options

A. A,B
B. A,B,C
C. B,C
D. B,C,D

Answer

A

Explanation

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 `2pi-` bonds and do not follow Hucke.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.
`therefore` (a) is the correct answer.