Chapter 8, Problem 68P

Interpretation Introduction

Interpretation:

Among the given compounds, the aromatic, anti-aromatic and non-aromatic have to be predicted.

Concept Introduction:

Criteria for Aromaticity:

1. 1. A molecule must be cyclic.
2. 2. Every atom in the ring must have a p-orbital.
3. 3. The molecule must be planar.
4. 4. Must satisfy $\left(\text{4n+2}\right)$ Huckel’s rule. $\text{π-}$ Cloud must contain an odd number of pairs of $\text{π-electrons}\text{.}$

Criteria for Anti-aromaticity:

1. 5. A molecule must be cyclic.
2. 6. Every atom in the ring must have a p-orbital.
3. 7. The molecule must be planar.
4. 8. Must satisfy $\left(\text{4n}\right)$ rule and contain Conjugated $\text{π-}$ Cloud.

Criteria for Non-Aromaticity:

A compound that lacks one (or more) of the following requirements for aromaticity: being cyclic, planar, and completely conjugated.