For the given cycloheptatrienone and cyclopentadienone, the more partial negative character on the oxygen atom of cycloheptatrienone should be explained. Concept introduction: A five membered ring will be aromatic if it contains six π electrons. In order to have six π electrons, one of the carbon atoms must possess two electrons. It should be a carbanion. A seven membered ring will be aromatic if it contains six π electrons. In order to have six π electrons in a seven membered ring one of the carbon atom must possess an empty p orbital. This carbocation exhibits a continuous system of overlapping and p orbitals and has six π electrons . Aromatic compounds are more stable than non-aromatic compound Cycloheptatrienone reveals resonance structures with aromatic character Cyclopentadienone reveals resonance structures with anti-aromatic character

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Chapter 18, Problem 53IP

Interpretation Introduction

Interpretation: For the given cycloheptatrienone and cyclopentadienone, the more partial negative character on the oxygen atom of cycloheptatrienone should be explained.

Concept introduction:

A five membered ring will be aromatic if it contains six π electrons. In order to have six π electrons, one of the carbon atoms must possess two electrons. It should be a carbanion.

A seven membered ring will be aromatic if it contains six π electrons. In order to have six π electrons in a seven membered ring one of the carbon atom must possess an empty p orbital. This carbocation exhibits a continuous system of overlapping and p orbitals and has six π electrons.

Aromatic compounds are more stable than non-aromatic compound

Cycloheptatrienone reveals resonance structures with aromatic character

Cyclopentadienone reveals resonance structures with anti-aromatic character

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