Question 1

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-1 and ~1750 cm^-1?

Accepted Answer

The IR peaks at 3000-3500 cm-1 are indicative of an -OH or -NH stretch, while the peak at ~1750 cm-1 is indicative of a carbonyl (C=O) stretch. Among the given compounds, only compound 3 (ethanol) contains both an -OH group and a carbonyl group (in the form of an ester). Therefore, compound 3 is the best choice for the given IR spectrum.

Question 2

Provide the structure of four compounds with the molecular formula C₅H₁₀O which give a strong absorption peak at 1700-1740 cm^-1 in the infrared spectrum, but no significant peaks at 1600-1640 cm^-1 .

Accepted Answer

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Question 3

Which of the following compounds gives an infrared spectrum with a peak at ~1750 cm^-1, but no significant peaks at 3000-3500 cm^-1 or 1050-1250 cm^-1?

Accepted Answer

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Question 4

Provide the structure of three compounds with the molecular formula C₄H₈O that give an absorption peak at 1600-1640 cm^-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm^-1 or at 1650-1750 cm^-1.

Accepted Answer

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Question 5

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm^-1 (strong, broad), but does not have peaks at 3200-3650 or 1000-1250 cm^-1

Accepted Answer

The infrared spectrum peaks at 1630-1820 cm-1 indicate the presence of a carbonyl group in the molecule. The absence of peaks at 3200-3650 cm-1 rules out the presence of an alcohol, and the absence of peaks at 1000-1250 cm-1 rules out the presence of an ether or ester. Thus, the best choice is B, which includes the carbonyl group in either an aldehyde or ketone.

Question 6

Which of the following compounds does not give an infrared spectrum with peak at ~1750 cm^-1?

Accepted Answer

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Question 7

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of 2-butanone is higher than that of 3-buten-2-one.

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Question 8

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH₃CON(CH₃)₂, is higher than that of methyl acetate, CH₃CO₂CH₃.

Accepted Answer

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Question 9

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-1 or 1600-1680 cm^-1?

Accepted Answer

The significant peaks at ~3300 cm^-1 and 1600-1680 cm^-1 are characteristic of stretching vibrations of O-H and C=O bonds, respectively. Compound 2 does not have any O-H or C=O bonds, so it would not show any significant peaks in these regions.

Question 10

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1000-1250 cm^-1 (strong), but does not have peaks 3200-3650 at 1630-1820 or cm^-1?

Accepted Answer

The infrared spectrum peaks at 1000-1250 cm-1 are characteristic of C-O stretching vibrations in ethers. The absence of peaks at 3200-3650 cm-1 and 1630-1820 cm-1 rules out the presence of alcohol, carboxylic acid, or carbonyl groups like aldehydes, ketones, and esters.

Question 11

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Accepted Answer

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Question 12

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Accepted Answer

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Question 13

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm^-1 (strong peak), but does not have peaks at 3200-3650 or 1000-1250 cm^-1?

Accepted Answer

Compound 2 contains a carbonyl group (C=O), which typically gives a strong peak in the 1630-1820 cm^-1 range in infrared spectroscopy. Compounds 1, 3, and 4 do not contain a carbonyl group and would not have a peak in this region. Additionally, compounds 1 and 4 contain OH groups, which would typically give peaks in the 3200-3650 cm^-1 range, and compound 3 contains a C-O bond, which would typically give a peak in the 1000-1250 cm^-1 range. Therefore, the only compound that fits the given criteria is compound 2.

Question 14

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak) and 2150 cm^-1 (sharp peak)?

Accepted Answer

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Question 15

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm^-1 (medium); but does not have peaks at 1630-1820 (strong)?

Accepted Answer

Compound 1 has peaks in the range of 3200-3650 cm^-1 and peaks at 1630-1820 cm^-1, which does not fulfill the given criteria.
Compound 2 has peaks in the range of 3200-3650 cm^-1 and peaks at 1600-1640 cm^-1 but it also has peaks at 1630-1820 cm^-1, which does not fulfill the given criteria.
Compound 3 has peaks in the range of 3200-3650 cm^-1 and peaks at 1600-1640 cm^-1, which fulfills the given criteria.
Compound 4 has peaks in the range of 3200-3650 cm^-1 and peaks at 1630-1820 cm^-1, which does not fulfill the given criteria.

Question 16

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad), but does not have peaks at 1630-1820 (strong) or 1600-1640 cm^-1 (medium)?

Accepted Answer

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Question 17

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Accepted Answer

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Question 18

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm^-1 (strong), but does not have peaks at 1630-1820 or 1000-1250 cm^-1

Accepted Answer

The peak at 3200-3650 cm^-1 in the infrared spectrum is characteristic of the O-H functional group in alcohols. The absence of peaks in the indicated regions suggests the molecule does not have an aldehyde, ketone, ether, or ester functional group. Therefore, the likely functional group present in the molecule is alcohol.

Question 19

Which of the following compounds gives an infrared spectrum with peaks at 1000-1250 cm^-1 (strong), but does not have peaks at 3200-3650 or 1630-1820 cm^-1 (sharp, weak peak)?

Accepted Answer

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Question 20

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Accepted Answer

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Quiz 12: Infrared Spectroscopy

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-1 and ~1750 cm^-1?

Provide the structure of four compounds with the molecular formula C₅H₁₀O which give a strong absorption peak at 1700-1740 cm^-1 in the infrared spectrum, but no significant peaks at 1600-1640 cm^-1 .

Which of the following compounds gives an infrared spectrum with a peak at ~1750 cm^-1, but no significant peaks at 3000-3500 cm^-1 or 1050-1250 cm^-1?

Provide the structure of three compounds with the molecular formula C₄H₈O that give an absorption peak at 1600-1640 cm^-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm^-1 or at 1650-1750 cm^-1.

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm^-1 (strong, broad) , but does not have peaks at 3200-3650 or 1000-1250 cm^-1

Which of the following compounds does not give an infrared spectrum with peak at ~1750 cm^-1?

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of 2-butanone is higher than that of 3-buten-2-one.

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH₃CON(CH₃)₂, is higher than that of methyl acetate, CH₃CO₂CH₃.

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-1 or 1600-1680 cm^-1?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1000-1250 cm^-1 (strong) , but does not have peaks 3200-3650 at 1630-1820 or cm^-1?

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm^-1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm^-1?

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak) and 2150 cm^-1 (sharp peak) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm^-1 (medium) ; but does not have peaks at 1630-1820 (strong) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm^-1 (medium) ?

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm^-1 (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm^-1

Which of the following compounds gives an infrared spectrum with peaks at 1000-1250 cm^-1 (strong) , but does not have peaks at 3200-3650 or 1630-1820 cm^-1 (sharp, weak peak) ?

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Quiz 12: Infrared Spectroscopy

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm-1 and ~1750 cm-1?

Provide the structure of four compounds with the molecular formula C5H10O which give a strong absorption peak at 1700-1740 cm-1 in the infrared spectrum, but no significant peaks at 1600-1640 cm-1 .

Which of the following compounds gives an infrared spectrum with a peak at ~1750 cm-1, but no significant peaks at 3000-3500 cm-1 or 1050-1250 cm-1?

Provide the structure of three compounds with the molecular formula C4H8O that give an absorption peak at 1600-1640 cm-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm-1 or at 1650-1750 cm-1.

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm-1 (strong, broad) , but does not have peaks at 3200-3650 or 1000-1250 cm-1

Which of the following compounds does not give an infrared spectrum with peak at ~1750 cm-1?

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of 2-butanone is higher than that of 3-buten-2-one.

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH3CON(CH3)2, is higher than that of methyl acetate, CH3CO2CH3.

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm-1 or 1600-1680 cm-1?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1000-1250 cm-1 (strong) , but does not have peaks 3200-3650 at 1630-1820 or cm-1?

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Which of the following compounds gives a carbonyl bond absorption at the highest frequency?

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm-1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm-1?

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm-1 (sharp peak) and 2150 cm-1 (sharp peak) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm-1 (medium) ; but does not have peaks at 1630-1820 (strong) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm-1 (medium) ?

Which of the following compounds gives a carbonyl bond absorption at the lowest frequency?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm-1 (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm-1

Which of the following compounds gives an infrared spectrum with peaks at 1000-1250 cm-1 (strong) , but does not have peaks at 3200-3650 or 1630-1820 cm-1 (sharp, weak peak) ?

How could you distinguish between 1-butanol and diethyl ether by infrared spectroscopy?

Which of the following compounds gives an infrared spectrum with peaks at 3000-3500 cm^-1 and ~1750 cm^-1?

Provide the structure of four compounds with the molecular formula C₅H₁₀O which give a strong absorption peak at 1700-1740 cm^-1 in the infrared spectrum, but no significant peaks at 1600-1640 cm^-1 .

Which of the following compounds gives an infrared spectrum with a peak at ~1750 cm^-1, but no significant peaks at 3000-3500 cm^-1 or 1050-1250 cm^-1?

Provide the structure of three compounds with the molecular formula C₄H₈O that give an absorption peak at 1600-1640 cm^-1 in the infrared spectrum, but no significant peaks at 3000-3600 cm^-1 or at 1650-1750 cm^-1.

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1630-1820 cm^-1 (strong, broad) , but does not have peaks at 3200-3650 or 1000-1250 cm^-1

Which of the following compounds does not give an infrared spectrum with peak at ~1750 cm^-1?

Provide a brief explanation to account for the observation that the frequency of the C=O stretching absorption in the infrared spectrum of N,N-dimethylacetamide, CH₃CON(CH₃)₂, is higher than that of methyl acetate, CH₃CO₂CH₃.

Which of the following compounds gives an infrared spectrum with no significant peaks at ~3300 cm^-1 or 1600-1680 cm^-1?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 1000-1250 cm^-1 (strong) , but does not have peaks 3200-3650 at 1630-1820 or cm^-1?

Which of the following compounds gives an infrared spectrum with a peak in the range of 1630-1820 cm^-1 (strong peak) , but does not have peaks at 3200-3650 or 1000-1250 cm^-1?

Which of the following compounds gives an infrared spectrum with peaks at 3300 cm^-1 (sharp peak) and 2150 cm^-1 (sharp peak) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) and 1600-1640 cm^-1 (medium) ; but does not have peaks at 1630-1820 (strong) ?

Which of the following compounds gives an infrared spectrum with peaks in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm^-1 (medium) ?

Which of the following functional groups is likely to be present in a molecule that has peaks in the infrared spectrum at 3200-3650 cm^-1 (strong) , but does not have peaks at 1630-1820 or 1000-1250 cm^-1

Which of the following compounds gives an infrared spectrum with peaks at 1000-1250 cm^-1 (strong) , but does not have peaks at 3200-3650 or 1630-1820 cm^-1 (sharp, weak peak) ?