Of Hückel's Requirements for Aromatic Character,only This One Is Waived $\pi$

question 59

Multiple Choice

Of Hückel's requirements for aromatic character,only this one is waived in the case of certain compounds considered to be aromatic.

• A)The ring system must be planar.
• B)The system must be monocyclic.
• C)There must be (4n + 2)\(\pi\) electrons.
• D)The Hückel number of electrons must be completely delocalized.
• E)None.All of these rules must apply in every case.

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Definitions:

Pleural Cavity

The thin space between the lung and the chest wall, lined by pleural membranes, containing a small amount of lubricating fluid.

Pleuritis

An inflammation of the pleura, the thin tissue layers surrounding the lungs, causing sharp chest pain.

Pleura

The thin membranes enveloping the lungs and lining the inside of the chest cavity, which help facilitate smooth lung movement during breathing.

Difficulty Breathing

A sensation of not being able to draw a deep breath or experiencing shortness of breath; a symptom of various medical conditions.