Question 1

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 2

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 presence of peaks in the infrared spectrum at 1630-1820 cm^-1 (strong, broad) is indicative of the C=O stretch found in aldehydes and ketones. The absence of peaks at 3200-3650 cm^-1 rules out alcohols, which would show O-H stretching in this region, and the absence of peaks at 1000-1250 cm^-1 rules out ethers and esters, which would show C-O stretching in this region.

Question 3

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

Accepted Answer

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Question 4

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)?

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Question 5

The region of the IR spectrum between 1500 - 400 cm^-1 would be significantly different for the following two substances?

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Question 6

Assume you are carrying out the conversion of 1-bromobutane to 1-butanol. How could you use IR spectroscopy to determine when the reaction is complete? As the reaction progress the 3400−3640 cm−¹ IR band should increase in intensity.

Accepted Answer

The answer of Assume you are carrying out the conversion...

Question 7

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 presence of peaks in the 3200-3650 cm^-1 range in the infrared spectrum indicates the presence of O-H stretching, which is characteristic of alcohols. The absence of peaks in the 1630-1820 cm^-1 range rules out carbonyl groups (found in aldehydes, ketones, and esters), and the absence of peaks in the 1000-1250 cm^-1 range suggests the absence of C-O stretching found in ethers and esters.

Question 8

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 9

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

Accepted Answer

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Question 10

Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm−¹ 2100-2260 cm−¹ 1650-1670 cm−¹

Accepted Answer

The regions mentioned correspond to absorptions for different functional groups: 3020-3100 cm^-1 for =C-H stretch (alkenes), 2100-2260 cm^-1 for ≡C-H stretch (alkynes), and 1650-1670 cm^-1 for C=C stretch (alkenes). Cyclohexene (an alkene) and 2-hexyne (an alkyne) can be distinguished by the presence or absence of these absorptions in their IR spectra.

Question 11

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

Accepted Answer

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Question 12

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the functional group region.

Accepted Answer

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the fingerprint region. The functional group region is typically found in the range of 4000 to 1400 cm^-1.

Question 13

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

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Question 14

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

Accepted Answer

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Question 15

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

Accepted Answer

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Question 16

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

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Question 17

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

Ethers typically show absorption peaks in the range of 1000-1250 cm^-1 due to C-O stretching vibrations, and they do not have the N-H or O-H stretching vibrations that would appear in the 3200-3650 cm^-1 range (characteristic of alcohols) or the C=O stretching vibrations in the 1630-1820 cm^-1 range (characteristic of aldehydes, ketones, and esters).

Question 18

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

The answer of Which of the following compounds gives an...

Question 19

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

The answer of Which of the following compounds gives an...

Question 20

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm^-1. This molecule is most likely an ether.

Accepted Answer

The strong absorption at 1715-1725 cm^-1 is characteristic of a carbonyl group (C=O), suggesting the molecule is more likely a ketone or aldehyde, not an ether.

Quiz 12: Infrared Spectroscopy

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 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 gives a carbonyl bond absorption at the lowest frequency?

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) ?

The region of the IR spectrum between 1500 - 400 cm^-1 would be significantly different for the following two substances?

Assume you are carrying out the conversion of 1-bromobutane to 1-butanol. How could you use IR spectroscopy to determine when the reaction is complete? As the reaction progress the 3400−3640 cm−¹ IR band should increase in intensity.

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 a peak at ∼1750 cm−¹, but no significant peaks at 3000-3500 cm−¹ or 1050-1250 cm−¹?

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

Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm−¹ 2100-2260 cm−¹ 1650-1670 cm−¹

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

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the functional group region.

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 at 3000-3500 cm−¹ and ∼1750 cm−¹?

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

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 in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm−¹ (medium) ?

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm^-1. This molecule is most likely an ether.

Quiz 12: Infrared Spectroscopy

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 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 gives a carbonyl bond absorption at the lowest frequency?

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) ?

The region of the IR spectrum between 1500 - 400 cm-1 would be significantly different for the following two substances?

Assume you are carrying out the conversion of 1-bromobutane to 1-butanol. How could you use IR spectroscopy to determine when the reaction is complete? As the reaction progress the 3400−3640 cm−1 IR band should increase in intensity.

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 a peak at ∼1750 cm−1, but no significant peaks at 3000-3500 cm−1 or 1050-1250 cm−1? ​ ​

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

Cyclohexene and 2-hexyne both have the molecular formula C6H10. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm−1 2100-2260 cm−1 1650-1670 cm−1

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

The area in the infrared spectrum between 1400 and 400 cm-1 is called the functional group region.

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 at 3000-3500 cm−1 and ∼1750 cm−1? ​ ​

Which of the following compounds does not give an infrared spectrum with peak at ∼1750 cm−1? ​ ​

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 in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm−1 (medium) ?

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm-1. This molecule is most likely an ether.

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 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 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) ?

The region of the IR spectrum between 1500 - 400 cm^-1 would be significantly different for the following two substances?

Assume you are carrying out the conversion of 1-bromobutane to 1-butanol. How could you use IR spectroscopy to determine when the reaction is complete? As the reaction progress the 3400−3640 cm−¹ IR band should increase in intensity.

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 a peak at ∼1750 cm−¹, but no significant peaks at 3000-3500 cm−¹ or 1050-1250 cm−¹?

Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds. 3020-3100 cm−¹ 2100-2260 cm−¹ 1650-1670 cm−¹

The area in the infrared spectrum between 1400 and 400 cm^-1 is called the functional group region.

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 at 3000-3500 cm−¹ and ∼1750 cm−¹?

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

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 in the ranges of 3200-3650 (strong, broad) , but does not have peaks at 1630-1820 (strong) or 1600-1640 cm−¹ (medium) ?

An IR spectrum of an unknown organic molecule having the formula which contains carbon, hydrogen, and oxygen reveals a strong absorption at 1715-1725 cm^-1. This molecule is most likely an ether.