CHM 2210 ORGANIC CHEMISTRY I1.Which of the following are considered to be bending (in-plane) vibrations?A.scissoring and waggingB.scissoring and twistingC.rocking and waggingD.rocking and twistingE.scissoring and rocking
2.Which of the following solvents is best used in infrared spectroscopy?
3.Which of the following is not a common bending vibration of a CH2group?
4.While cleaning the organic stockroom, a student found a bottle of ethanol labeled "Denatured with Benzene." He decided to determine the concentration of benzene in the ethanol by acquiring the UV spectrum of the liquid in a 2.0 cm cell. The spectrum exhibited an absorption band at 260 nm which was attributable to benzene, and the absorbance of this band was 0.69. In a reference source, the student found that the molar absorptivity of this benzene band in ethanol was 230 M-1cm-1. Show how the student calculated the concentration of the benzene in the ethanol.
5.Which molecule below has a significant band in the IR at 2220 cm-1(medium)?A.CH3CH2CH2OHB.CH3C≡CCH2CH3C.CH3CH2CH(NH2)CH3D.(CH3)3NE.CH3CO2CH2CH3
6.Which of the following statements best explains the information we can gain from infrared spectroscopy?