Chapter 16, Problem 16.32SP

(a)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity, that is, $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(b)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(c)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(d)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(e)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(f)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(g)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.

(h)

Interpretation Introduction

Interpretation:

The classification of each of the given compounds as aromatic, antiaromatic or non-aromatic and number of pi electrons present in the aromatic or antiaromatic ring is to be stated.

Concept introduction:

The conditions that a molecule must follow to be aromatic are shown below.

• The given compound must be cyclic in nature.
• It must be planar.
• There must be no ${\text{sp}}^3$ hybridized carbon in the given compound.
• The compound must follow Huckel’s rule of aromaticity that is $\left(4n+2\right)\text{π}$ electron system must be present.

If the given compound follows first three conditions but it follows $4n\text{π}$ electron system, then it is antiaromatic in nature. If the given compound fails to follow any of the above conditions then it is non-aromatic in nature.