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What functional groups give the following signals in an IR spectrum? A) 1700 cm-1. B) 1550 cm-1. C) 1700 cm-1 and 2510-3000 cm-1. 2. How can you distinguish the following pairs of compounds through IR analysis? A) CH 3 OH (Methanol) and CH 3 CH 2 OCH 2 CH 3 (Diethylether) B) Cyclopentane and 1-pentene. C) 3. The following spectra is for the ...
All IR spectra have many absorptions, but those useful for identifying specific functional groups are usually found in the region from 1500 cm –1 to 3300 cm –1. Pay particular attention to the carbonyl region (1670 to 1780 cm –1 ), the aromatic region (1660 to 2000 cm –1 ), the triple-bond region (2000 to 2500 cm –1 ), and the C–H ...
Table 12.1 lists the characteristic IR bands of some common functional groups. Table 12.1 Characteristic IR Absorptions of Some Functional Groups. Look at the IR spectra of hexane, 1-hexene, and 1-hexyne in Figure 12.21 to see an example of how IR spectroscopy can be used.
Objectives. After completing this section, you should be able to use an infrared spectrum to determine the presence of functional groups, such as alcohols, amines and carbonyl groups, in an unknown compound, given a list of infrared absorption frequencies. Study Notes.
Be able to analyze an IR spectrum for important functional group bands. With the basic understanding of the IR theory, we will take a look at the actual output from IR spectroscopy experiments, and learn how to get structural information from IR spectrum. Below is the IR spectrum for 2-hexanone (Fig 5.3a). Figure 5.3a IR Spectrum of 2-hexanone.
