Chapter 15, Problem 26P

Interpretation Introduction

(a)

Interpretation: The number of pi electrons in the given molecule is to be determined.

Concept introduction: A molecule must be cyclic, planar, completely conjugated and should follow Huckel’s rule to be classified as aromatic. For an antiaromatic molecule, the molecule must be cyclic, planar, completely conjugated and have $4n\pi$ electrons. For a non-aromatic molecule, the molecule lacks the one of the requirements to be aromatic or anti aromatic molecule.

According to the Huckel’s rule, the number of $\pi$ electrons in the molecule must be equal to $\left(4n+2\right)$.

Interpretation Introduction

(b)

Interpretation: The number of pi electrons in the given molecule is to be determined.

Concept introduction: A molecule must be cyclic, planar, completely conjugated and should follow Huckel’s rule to be classified as aromatic. For an antiaromatic molecule, the molecule must be cyclic, planar, completely conjugated and have $4n\pi$ electrons. For a non-aromatic molecule, the molecule lacks the one of the requirements to be aromatic or anti aromatic molecule.

According to the Huckel’s rule, the number of $\pi$ electrons in the molecule must be equal to $\left(4n+2\right)$.

Interpretation Introduction

(c)

Interpretation: The number of pi electrons in the given molecule is to be determined.

Concept introduction: A molecule must be cyclic, planar, completely conjugated and should follow Huckel’s rule to be classified as aromatic. For an antiaromatic molecule, the molecule must be cyclic, planar, completely conjugated and have $4n\pi$ electrons. For a non-aromatic molecule, the molecule lacks the one of the requirements to be aromatic or anti aromatic molecule.

According to the Huckel’s rule the number of $\pi$ electrons in the molecule must be equal to $\left(4n+2\right)$.

Interpretation Introduction

(d)

Interpretation: The number of pi electrons in the given molecule is to be determined.

Concept introduction: A molecule must be cyclic, planar, completely conjugated and should follow Huckel’s rule to be classified as aromatic. For an antiaromatic molecule, the molecule must be cyclic, planar, completely conjugated and have $4n\pi$ electrons. For a non-aromatic molecule, the molecule lacks the one of the requirements to be aromatic or anti aromatic molecule.

According to the Huckel’s rule the number of $\pi$ electrons in the molecule must be equal to $\left(4n+2\right)$.