Question

Which of these cyclopropene systems is aromatic ?

• A. $\text{I}$
• B. $\text{II}$
• C. $\text{III}$
• D. $\text{All of these}$

Answer 1

Answer: (C)

Non-aromatic as saturated C has sp³ hybridization thus the molecule is non-planar.


It has $4\pi e^{-}$ which can be delocalised. Here, it does not obey Huckel's rule of aromaticity and hence non-aromatic.

Number of pi electrons = 2 and all carbons are sp² hybridised making the compound planar. Hence, it is an aromatic species.