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Exam 12: Infrared Spectroscopy

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Question 1

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MATCH each of the following groups of bond-types to the region of the infrared spectrum in which their absorptions occur. Place the letter of the region in the blank to the left of the bond-type. -_____ C−C, C−O, C−N, and C−X single-bond vibrations.

A) 4000 to 2500 cm−¹
B) 2500 to 2000 cm−¹
C) 2000 to 1500 cm−¹
D) below 1500 cm−¹

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Question 2

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How could you distinguish between methyl butanoate and pentanoic acid by infrared spectroscopy?

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The infrared spectrum of penta...

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Question 3

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

Which of the following regions in the electromagnetic spectrum corresponds to the radiation with the longest wavelength?

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C₄H₉NO)? ​

MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type. -_______ CH₃CH₂OCH(CH₃)

How could you distinguish between 1-hexyne and 2-hexyne by infrared spectroscopy?

Which of the following bonds gives rise to a strong absorbance at approximately 1630-1820 cm−¹ in the infrared spectrum?

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 bonds (circled) gives the weakest absorbance in the infrared spectrum?

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.

MATCH each of the following molecules to the region of the infrared spectrum in which they may show a significant absorption. Place the letter of the region in the blank to the left of the bond-type. -_______ $\mathrm{H}_{3} \mathrm{C}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$

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

In terms of the electromagnetic spectrum, 2870 cm−¹ represents lower energy than 2.91 × 10¹⁶ Hz.

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

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 bonds gives rise to a strong, broad, absorbance at approximately 3200-3650 cm−¹ in the infrared spectrum?

Label three peaks in the following spectrum with the bond that gives rise to them, and identify the functional group that is present in the compound (the compound has a formula of C₆H₁₄O)? ​

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 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.