The spectrum of cyclohexane and cyclohexene has to be identified and explained. Concept introduction: Spectroscopy: It is study of the interaction of matter and electromagnetic radiation, a continuum of different types of electromagnetic radiation each associated with a particular energy range makes up the electromagnetic spectrum. IR frequency (cm -1 ): It is the number of wave crests that pass by a given point in one second frequency has units of hertz (Hz). Stretch vibrations: It is a vibration occurring along the line of the bond a stretching vibration changes the bond length. Bending vibrations: It is a vibration that does not occur along the line of the bond, bending vibration changes the bond angle.

Question

Look at the three infrared spectra in Figures C to E and answer the following questions (a) Are any of the spectra that of an alcohol? If so, which? What absorption pattern(s) at what wavelength(s) identifies an alcohol? (b) Are any of the spectra that of a compound containing a benzene ring? If so, which? What three absorption patterns at what wavelengths show that a compound has a benzene ring? (c) Are any of the spectra that of a compound containing only carbons and hydrogens? If so, which? Benzene rings contain only carbons and hydrogens. Might the spectrum or spectra you chose for your answer above indicate a benzene ring? (Tell what absorption patterns are present or not present that would support your answer.)

Answer 1

Question

Chapter 12.SE, Problem 32AP

Interpretation Introduction

Interpretation:

The spectrum of cyclohexane and cyclohexene has to be identified and explained.

Concept introduction:

Spectroscopy: It is study of the interaction of matter and electromagnetic radiation, a continuum of different types of electromagnetic radiation each associated with a particular energy range makes up the electromagnetic spectrum.

IR frequency (cm^-1): It is the number of wave crests that pass by a given point in one second frequency has units of hertz (Hz).

Stretch vibrations: It is a vibration occurring along the line of the bond a stretching vibration changes the bond length.

Bending vibrations: It is a vibration that does not occur along the line of the bond, bending vibration changes the bond angle.

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Look at the three infrared spectra in Figures C to E and answer the following questions (a) Are any of the spectra that of an alcohol? If so, which? What absorption pattern(s) at what wavelength(s) identifies an alcohol? (b) Are any of the spectra that of a compound containing a benzene ring? If so, which? What three absorption patterns at what wavelengths show that a compound has a benzene ring? (c) Are any of the spectra that of a compound containing only carbons and hydrogens? If so, which? Benzene rings contain only carbons and hydrogens. Might the spectrum or spectra you chose for your answer above indicate a benzene ring? (Tell what absorption patterns are present or not present that would support your answer.)

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