Orbital energy diagrams for [10]annulene and [12]annulene are to be constructed and the aromaticity of either one is to be determined on the basis of Huckel’s rule . Concept introduction: Huckel MOs are determined by constructing Frost’s circle. It is a polygon with appropriate number of sides inscribed in a circle with one of the corners at the bottom. A horizontal line is drawn through the center of the diagram. MOs that lie below this line are bonding MOs; those on the line are nonbonding while those above the line are antibonding MOs. In an aromatic compound , all pi-electrons are paired up in bonding MOs. If there are unpaired electrons, then the compound is anti-aromatic or non-aromatic.

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Answer 1

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Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 12.19, Problem 21P

Interpretation Introduction

Interpretation:

Orbital energy diagrams for [10]annulene and [12]annulene are to be constructed and the aromaticity of either one is to be determined on the basis of Huckel’s rule.

Concept introduction:

Huckel MOs are determined by constructing Frost’s circle. It is a polygon with appropriate number of sides inscribed in a circle with one of the corners at the bottom. A horizontal line is drawn through the center of the diagram. MOs that lie below this line are bonding MOs; those on the line are nonbonding while those above the line are antibonding MOs.

In an aromatic compound, all pi-electrons are paired up in bonding MOs. If there are unpaired electrons, then the compound is anti-aromatic or non-aromatic.

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Transmitance 3. Which one of the following compounds corresponds to this IR spectrum? Point out the absorption band(s) that helped you decide. OH H3C OH H₂C CH3 H3C CH3 H3C INFRARED SPECTRUM 0.8- 0.6 0.4- 0.2 3000 2000 1000 Wavenumber (cm-1) 4. Consider this compound: H3C On the structure above, label the different types of H's as A, B, C, etc. In table form, list the labeled signals, and for each one state the number of hydrogens, their shifts, and the splitting you would observe for these hydrogens in the ¹H NMR spectrum. Label # of hydrogens splitting Shift (2)

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Answer 2

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 12.19, Problem 21P

Interpretation Introduction

Interpretation:

Orbital energy diagrams for [10]annulene and [12]annulene are to be constructed and the aromaticity of either one is to be determined on the basis of Huckel’s rule.

Concept introduction:

Huckel MOs are determined by constructing Frost’s circle. It is a polygon with appropriate number of sides inscribed in a circle with one of the corners at the bottom. A horizontal line is drawn through the center of the diagram. MOs that lie below this line are bonding MOs; those on the line are nonbonding while those above the line are antibonding MOs.

In an aromatic compound, all pi-electrons are paired up in bonding MOs. If there are unpaired electrons, then the compound is anti-aromatic or non-aromatic.

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Check out a sample textbook solution

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Answer 3

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 12.19, Problem 21P

Interpretation Introduction

Interpretation:

Orbital energy diagrams for [10]annulene and [12]annulene are to be constructed and the aromaticity of either one is to be determined on the basis of Huckel’s rule.

Concept introduction:

Huckel MOs are determined by constructing Frost’s circle. It is a polygon with appropriate number of sides inscribed in a circle with one of the corners at the bottom. A horizontal line is drawn through the center of the diagram. MOs that lie below this line are bonding MOs; those on the line are nonbonding while those above the line are antibonding MOs.

In an aromatic compound, all pi-electrons are paired up in bonding MOs. If there are unpaired electrons, then the compound is anti-aromatic or non-aromatic.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Definition Definition Rule that estimates whether a given organic planar ring structure will show an aromatic property. A cyclic ring molecule is said to follow Hückel’s rule if the л-electrons count in a molecule is [4n+2], where n stands for a positive numerical value. It is also called the [4n+2] rule. Hückel's rule, sometimes referred to as the aromaticity rule, is one but not the only criteria to judge a molecule for aromaticity.

Chapter 12.19, Problem 21P

Interpretation Introduction