Chapter 18, Problem 67IP

Interpretation Introduction

Interpretation:

1. 1) For the given compounds A and B, it should be checked whether the 14- membered ring in the compound B are aromatic or not.
2. 2) Resonance structure of the compound B should be drawn by showing the delocalization of negative charge.
3. 3) Resonance structure of the compound B should be drawn by showing the delocalization of unpaired electrons.

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)