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- 6. For each of the following molecules: i) Fill in all the C-H bonds; ii) Then identify FOUR unlque stretching frequencies that will appear in the IR spectrum in the region 1600-4000 cm ; and prediet the position (cm-1), shape and intensity of each band. a) C=C-C-H ON b) CミC-C--c と- c-と-CEN c)6-Infrared spectroscopy provides valuable information about molecular weight. B) melting point. C) conjugation. 7-Which of the following is not an IR vibrational mode? stretching B scissoring C rocking D rolling A) A 8- Which of these molecules best corresponds to the IR spectrum below? O • H₂C. m m m m b) m m но OH c) 3300 2900 2800 1465 1450 1375 HO 9-A strong signal at 1700 cm-1 in an IR spectrum indicates the presence of a(n) A) C) carbonyl D) amine D) functional groups. alcohol B) ether 10-Deduce the structure of an unknown compound with molecular formula CsH12O using information given by its infrared spectrum. Intensity (peak): Frequency (cm¹¹): d E wagging B- •) nammm 1000 HO OCH, X 11-Which of the following bonds would be expected to have the highest frequency= double bondD Consider the folleray pairs of mikeuden. Start succintly wofinced spectroscopy & GC MS 6 deyish Some either which molecule which Ć Ө
- 6- Below are the figures of two infrared spectra (IR). One corresponds to the spectrum of the cyclohexane compound and the other corresponds to the cyclohexene. Identify each IV with its respective compound and indicate the frequencies and modes of vibration.(d) Explain, why [Co(H,O)62+ is pale pink 2 max = 10 cm mol-) la12- whereas C C1 is deep'blue (Emax = 600 cm mol). (3) %3D max Predict the possible transitions in cach case.T → TT molecule? 243 nm |1,3-cyclohexadiene 254 nm [ Select ] 288 nm [ Select ] 315 nm [ Select ] 357 nm [ Select ] Which of the aromatic molecules belongs to these different pi to pi* transitions?
- Which of the following electronic transitions are available to 2-pyrazoline? n→o* All of the aboveThe C=0 stretching frequency for butanal is centered at 1746 cm-1, whereas the one for butan-2-one is centered at 1735 cm¯1. Explain the difference. 1746 cm-1 1735 cm-1Long-range coupling between protons more than two carbon atoms apart is sometimes observed when bonds intervene. An example is found in 1-methoxy-l-buten-3-yne. Not only does the acetylenic proton, Ηa, couple with the vinylic proton Hb, it also couples with the vinylic proton Hc, four carbon atoms away. The data are: Construct tree diagrams that account for the observed splitting patterns of Ηa, Hb, and Hc.
- Watch videos (LINKS) on page 2 and answer questions One infrared spectra (1) is given below. (a) Analyze the spectra and tabulate important bands. (b) Circle the possible molecular structure corresponding to the given spectra. Spectra A: 4000 2700 cm ¹ 2700- 2000 cm ¹ 2000 1600 cm 1600 - 400 cm ¹ 2.5 100 80 Region 60 40 20 0 OL 4000 (a) COMPOUNDS A OH 3500 3 -1 3000 B Absorption, cm -1 3.5 4 2500 4.5 SPECTRA 1 CH, O CH, C C CH, H H NO H wavelength (um) 5 5,5 6 2000 1800 1600 wavenumber (cm) wavelength (um) C Functional group CIC C-OH CH, 7 8 1400 1200 D 9 10 n 1000 CH₂CH₂OH - 11 Base Value 12 13 14 15 16 800 600 E Jun CH₂-C-N5. Draw the product and predict the position of the equilibrium for the following sigmatropic shifts کرے 110. In the UV-visible spectrum of (E)-1,3,5-hexatriene, the lowest energy absorption corresponds to: A) a o to a transition. B) a o to n* transition. C) an to o* transition. D) a o to o" transition. E) an to n" transition.