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Exam 12: Infrared Spectroscopy

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Question 31

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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 32

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Which of the following carbon-carbon bonds undergoes stretching at the highest frequency?

A) sp³ C -sp³ C
B) alkene sp² C - sp² C
C) arene sp² C - sp² C
D) C $\equiv$ C

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Question 33

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he amount of energy in infrared light corresponds to the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules.

Which of the following bonds gives rise to a medium strength absorbance at approximately 1600-1680 cm^-1 in the infrared spectrum?

Which of the following bonds (circled) gives a very weak or no stretching absorption in the infrared spectrum?

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=O, C=N, and C=C bond absorptions.

Which of the following bonds gives the weakest peak in the infrared spectrum for a stretching vibration?

Provide a brief explanation to account for the observation that 1-butyne gives a significantly stronger peak at ~1250 cm^-1 in the infrared spectrum than 2-butyne..

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.

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.

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

What is required for a bond to give an infrared absorption?

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 .

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 regions in the electromagnetic spectrum corresponds to the radiation with the highest energy?

MATCH a structure from the list below to the following IR spectra. Place the letter of the structure in the blank provided. -_____ Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/

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 a carbonyl bond absorption at the highest frequency?

In terms of the electromagnetic spectrum, 2870 cm^-1represents lower energy than 2.91 * 10¹⁶ Hz.

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