Whether the given compound will have a significant dipole moment is to be determined. If so, the direction of the dipole moment is to be determined. Concept introduction: If two rings are with conjugated double bonds and are joined by a double bond, it is possible that one or both may achieve aromatic stabilization if the π electron pair of the double bond in the middle moves to one carbon. The resulting charge separation will make the molecule polar. Additionally, the delocalization of the charge due to the aromatic character of the ring(s) will increase the separation between charges, giving the molecule a substantial dipole moment. The direction of a molecular dipole is from the atom or region with a positive charge toward the atom or region with a negative charge.

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Chapter 14, Problem 14.54P

Interpretation Introduction

Interpretation:

Whether the given compound will have a significant dipole moment is to be determined. If so, the direction of the dipole moment is to be determined.

Concept introduction:

If two rings are with conjugated double bonds and are joined by a double bond, it is possible that one or both may achieve aromatic stabilization if the π electron pair of the double bond in the middle moves to one carbon.

The resulting charge separation will make the molecule polar. Additionally, the delocalization of the charge due to the aromatic character of the ring(s) will increase the separation between charges, giving the molecule a substantial dipole moment.

The direction of a molecular dipole is from the atom or region with a positive charge toward the atom or region with a negative charge.

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