What part of the electromagnetic spectrum is known as the infrared region? Expre

Question

What part of the electromagnetic spectrum is known as the infrared region? Express your answer in terms of both frequency and wavelength. What is the frequency range of the characteristic absorption bands of the following bonds? (a) C=O______ (b) O-H______ (c) C=C________ (d) C-C______ Describe two significant differences between the infrared spectra of ethyl alcohol and ethylene. Which region in the IR spectrum could be used to distinguish between butanoic acid and 2-butanone? (a) 3200-3600 cm^-1 (b) 1600 cm^-1 (c) 1680-1750 cm^-1 (d) 2500-3300 cm^-1

Explanation / Answer

problem 2

frequency range for carbonyl group C=O = 1670 - 1820 cm-1

frequency range for hydroxy group is O-H = 3500 - 3700 cm-1

frequency range for alkene group is -C=C = 1400 - 1600 cm-1

frequency range for alkane group is -C-C = 1150 - 1300 cm-1

Problem 3:

ethyl alcohol will have streaching frequency at 3500 cm-1 for OH group

ethylene will have streaching frequency at 1500 cm-1 for C=C group

problem 4:

butanoic acid will have OH streaching frequency in the range of 3200 - 3600 cm-1

butanone wil have carbonyl streaching frequency in the range of 1680 - 1750 cm-1

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