The bands in Figure 15-22 that correspond to the aldehyde C-H stretch are to be identified. Concept introduction: All C-H stretches appear between 27 00 and, 3300 cm -1 . Within that range, however, the location of the C-H absorption band is often characteristic of a particular compound class: Alkyne C-H , ∼ 33 00 cm − 1 (moderate intensity). Alkene C-H , between 3 000 , and 31 00 cm − 1 (variable intensity). Aromatic C-H , 3000–3100 cm -1 (variable intensity). Alkane C-H , 2800–3000 cm -1 (variable intensity). Aldehyde C-H , two peaks: ∼ 272 0 and ∼ 282 0 cm − 1 (moderate intensity). The presence or absence of one of these absorptions can help us narrow our choices of compounds when another region of the spectrum is difficult to interpret unambiguously.

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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 15, Problem 15.18YT

Interpretation Introduction

Interpretation:

The bands in Figure 15-22 that correspond to the aldehyde C-H stretch are to be identified.

Concept introduction:

All C-H stretches appear between 2700 and, 3300 cm-1. Within that range, however, the location of the C-H absorption band is often characteristic of a particular compound class: Alkyne C-H, ∼3300 cm−1 (moderate intensity). Alkene C-H, between 3000, and 3100 cm−1 (variable intensity). Aromatic C-H, 3000–3100 cm-1 (variable intensity). Alkane C-H, 2800–3000 cm-1 (variable intensity). Aldehyde C-H, two peaks: ∼2720 and ∼2820 cm−1 (moderate intensity). The presence or absence of one of these absorptions can help us narrow our choices of compounds when another region of the spectrum is difficult to interpret unambiguously.

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Answer 2

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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 15, Problem 15.18YT

Interpretation Introduction

Interpretation:

The bands in Figure 15-22 that correspond to the aldehyde C-H stretch are to be identified.

Concept introduction:

All C-H stretches appear between 2700 and, 3300 cm-1. Within that range, however, the location of the C-H absorption band is often characteristic of a particular compound class: Alkyne C-H, ∼3300 cm−1 (moderate intensity). Alkene C-H, between 3000, and 3100 cm−1 (variable intensity). Aromatic C-H, 3000–3100 cm-1 (variable intensity). Alkane C-H, 2800–3000 cm-1 (variable intensity). Aldehyde C-H, two peaks: ∼2720 and ∼2820 cm−1 (moderate intensity). The presence or absence of one of these absorptions can help us narrow our choices of compounds when another region of the spectrum is difficult to interpret unambiguously.

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Answer 3

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 15, Problem 15.18YT

Interpretation Introduction

Interpretation:

The bands in Figure 15-22 that correspond to the aldehyde C-H stretch are to be identified.

Concept introduction:

All C-H stretches appear between 2700 and, 3300 cm-1. Within that range, however, the location of the C-H absorption band is often characteristic of a particular compound class: Alkyne C-H, ∼3300 cm−1 (moderate intensity). Alkene C-H, between 3000, and 3100 cm−1 (variable intensity). Aromatic C-H, 3000–3100 cm-1 (variable intensity). Alkane C-H, 2800–3000 cm-1 (variable intensity). Aldehyde C-H, two peaks: ∼2720 and ∼2820 cm−1 (moderate intensity). The presence or absence of one of these absorptions can help us narrow our choices of compounds when another region of the spectrum is difficult to interpret unambiguously.

Expert Solution & Answer

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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 15, Problem 15.18YT

Interpretation Introduction