The protons D–H are to be ranked in order from largest chemical shift to smallest. Concept introduction: A proton’s absorption peak is shifted downfield (i.e., to higher chemical shift) by nearby electronegative atoms. This downfield shift occurs because electronegative atoms are inductively electron withdrawing, so they remove electron density from the nearby proton. The proton is said to be deshielded, resulting in a higher signal frequency, and thus, a larger chemical shift. Magnetic anisotropy deshields hydrogen nuclei associated with simple alkenes and aldehydes . The inductive effect and magnetic anisotropy shifts the proton signal downfield leading to a higher chemical shift. The effects that cause deshielding are essentially additive. Deshielding effects fall off very rapidly with distance.

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 16, Problem 16.15P

Interpretation Introduction

Interpretation:

The protons D–H are to be ranked in order from largest chemical shift to smallest.

Concept introduction:

A proton’s absorption peak is shifted downfield (i.e., to higher chemical shift) by nearby electronegative atoms. This downfield shift occurs because electronegative atoms are inductively electron withdrawing, so they remove electron density from the nearby proton. The proton is said to be deshielded, resulting in a higher signal frequency, and thus, a larger chemical shift. Magnetic anisotropy deshields hydrogen nuclei associated with simple alkenes and aldehydes. The inductive effect and magnetic anisotropy shifts the proton signal downfield leading to a higher chemical shift. The effects that cause deshielding are essentially additive. Deshielding effects fall off very rapidly with distance.

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[Review Topics] [References] The chemical environment of protons can be deduced from their chemical shifts. What are the relative chemical shifts of the protons at the labeled positions? [Protons that are highly shielded have low delta (chemical shift) values.] 1) r The proton with the lowest delta value (the most shielded) is The proton with the highest delta value (the most deshielded) is 2) The proton with the lowest delta value (the most shielded) is The proton with the highest delta value (the most deshielded) is Submit Answer Retry Entire Group 9 more group attempts remaining

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 16, Problem 16.15P

Interpretation Introduction

Interpretation:

The protons D–H are to be ranked in order from largest chemical shift to smallest.

Concept introduction:

A proton’s absorption peak is shifted downfield (i.e., to higher chemical shift) by nearby electronegative atoms. This downfield shift occurs because electronegative atoms are inductively electron withdrawing, so they remove electron density from the nearby proton. The proton is said to be deshielded, resulting in a higher signal frequency, and thus, a larger chemical shift. Magnetic anisotropy deshields hydrogen nuclei associated with simple alkenes and aldehydes. The inductive effect and magnetic anisotropy shifts the proton signal downfield leading to a higher chemical shift. The effects that cause deshielding are essentially additive. Deshielding effects fall off very rapidly with distance.

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Answer 3

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 16, Problem 16.15P

Interpretation Introduction

Interpretation:

The protons D–H are to be ranked in order from largest chemical shift to smallest.

Concept introduction:

A proton’s absorption peak is shifted downfield (i.e., to higher chemical shift) by nearby electronegative atoms. This downfield shift occurs because electronegative atoms are inductively electron withdrawing, so they remove electron density from the nearby proton. The proton is said to be deshielded, resulting in a higher signal frequency, and thus, a larger chemical shift. Magnetic anisotropy deshields hydrogen nuclei associated with simple alkenes and aldehydes. The inductive effect and magnetic anisotropy shifts the proton signal downfield leading to a higher chemical shift. The effects that cause deshielding are essentially additive. Deshielding effects fall off very rapidly with distance.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 16, Problem 16.15P

Interpretation Introduction