Chapter 17.4, Problem 9CC

Interpretation Introduction

Interpretation: For the given cation, using Frost circle an energy diagram should be drawn and it should be predicted whether this cation exhibit aromatic stabilization or not

Concept introduction:

• The conditions for aromatic compound are,

1. 1. 1. It should be planar
   2. 2. It must obey the Huckel’s rule

The requirement of an odd number of electron pair is called Huckel’s rule. A     compound can only be aromatic if the number of $\text{π}$ electron in the ring is 2, 6,10,14,18 and so on. This series of number can be expressed mathematically as $\text{4n+2}$, where n should be an integer and the compound is aromatic.

1. 3. Continuous conjugated $\text{π}$ system(all carbon should be in ${\text{sp}}^{\text{2}}$ hybridized state)

If any compound which doesn’t satisfy one of the above condition then the compound is not aromatic

• A Frost circle is used to draw an energy diagram showing the relative energy levels of the molecular orbitals associated with ring comprised of a continuous conjugated $\text{π}$ system