Reason for the methyl groups shift from − 3.9 p p m to − 1.8 p p m in the 1 H NMR spectrum of the given compound has to be explained Concept Introduction: 1 H NMR spectroscopy: It is the study of the interaction between electromagnetic radiation and the protons in the compound Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million). The conditions for aromatic compound are, It should be cyclic It should be planar (all atoms in the same plane) It must obey the Huckel’s rule (have electrons.) It must be conjugated π system(all carbon should be in sp 2 hybridized state)

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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 17, Problem 70CP

Interpretation Introduction

Interpretation: Reason for the methyl groups shift from −3.9 ppm to −1.8 ppm in the 1H NMR spectrum of the given compound has to be explained

Concept Introduction:

1H NMR spectroscopy: It is the study of the interaction between electromagnetic radiation and the protons in the compound

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

The conditions for aromatic compound are,

It should be cyclic

It should be planar (all atoms in the same plane)

It must obey the Huckel’s rule (have electrons.)

It must be conjugated π system(all carbon should be in sp2 hybridized state)

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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 17, Problem 70CP

Interpretation Introduction

Interpretation: Reason for the methyl groups shift from −3.9 ppm to −1.8 ppm in the 1H NMR spectrum of the given compound has to be explained

Concept Introduction:

1H NMR spectroscopy: It is the study of the interaction between electromagnetic radiation and the protons in the compound

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

The conditions for aromatic compound are,

It should be cyclic

It should be planar (all atoms in the same plane)

It must obey the Huckel’s rule (have electrons.)

It must be conjugated π system(all carbon should be in sp2 hybridized state)

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Answer 3

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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 17, Problem 70CP

Interpretation Introduction

Interpretation: Reason for the methyl groups shift from −3.9 ppm to −1.8 ppm in the 1H NMR spectrum of the given compound has to be explained

Concept Introduction:

1H NMR spectroscopy: It is the study of the interaction between electromagnetic radiation and the protons in the compound

Chemical shift: The frequency of the proton signal in the spectrum with reference to the standard compound which may be TMS(Tetramethylsilane) shows signal at 0 ppm(parts per million).

The conditions for aromatic compound are,

It should be cyclic

It should be planar (all atoms in the same plane)

It must obey the Huckel’s rule (have electrons.)

It must be conjugated π system(all carbon should be in sp2 hybridized state)

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Check out a sample textbook solution

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Answer 4

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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 17, Problem 70CP

Interpretation Introduction