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- 9 What compound has a formula of C5H120 * ?and a peak at 3300 cm-1 (ähäi 1) Ether Alcohol Aldehyde KetoneWhat IR frequencies would enable a chemist to distinguish between these molecules? CH;CH2OH and CH;CH2OCH;CH3 and CH, HCHCHCCIICH CH, d 3000-3100 cm-1 (=C-H)| 1620-1680 cm-1 (C=C) 3200-3400 cm-1 (OH) || 3000-3100 cm-1 (=C-H)Using a 60 MHz spectrometer, a chemist observes the following peak: doublet, J = 7 Hz, at 4.00 ppm How many hertz away from the TMS (tetramethylsilane, defined as 0 ppm) peak would this peak be in a spectrum collected on a 300 MHz spectrometer?
- 13C(1h) what is bracket mean in this case? is that mean carbon nmr proton nmr in same time?(a) What would be the chemical shift of a peak that is observed at 655.2 Hz from the reference tetramethylsilane (TMS) recorded using a 90 MHz spectrometer ? (b) At what frequency would the chemical shift of chloroform (CHCl3, δ = 7.28 ppm) occur relative to TMS on a spectrum recorded on a 300 MHz spectrometer? (c) At what frequency and chemical shift would the signal for chloroform occur when using a 1 GHz NMR spectrometer?The porphyrin molecule has 18 a electrons. If we approximate the length of the molecule by 1105 pm, then what is the predicted lowest energy absorption of the porphyrin molecule? (The experimental value is = 17000 cm-1 for a length of 1000 pm.) V = 4.0 cm-1 (4 sig fig)
- Using a 60 MHz spectrometer, a chemist observes the following peak: doublet, J = 7 Hz, at 4.00 ppm How many hertz away from the TMS (tetramethylsilane, defined as 0 ppm) peak is this peak in the 60 MHz spectrum?Chemistry 58 un 5 5 498 998 ¥ a ल OOGL 0OSZ 3000 3500 Navenumbers (cm-1) Please annotate this IR and label ALL peaksThe IR spectrum of 2-methyl-1-butanol (H;CCH,CH(CH;) CH,OH) and tert-butyl methyl ether [(CH;);COCH3] are shown below. Assign cach spectrum to the correct com- pound and identify the frequencies and the functional groups used to support your assignment. λ (μm) 6 7 8 9 10 11 12 1314 15 2.5 100 3 5 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm-1) A (µm) 7 8 9 10 11 12 13 14 15 2.5 100 3 5 20 4 6 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬!) (%) Transmission (%) Transmission 20
- Aspirin has several significant peaks in the FTIR. Match the most significant peaks below (in wavenumbers, cm ¹) with the bond to which the peak corresponds. HO₂C. 3100 (Broad) 1765 1690 1200 H₂C 2950 3050 C-H (sp2-carbon) C=O (ester) C=O (carboxylic acid) C-O O-H C-H (sp3-carbon) → + + + → →4. NMR: (8 pts) Look at the given molecules and answer the following questions H H Compound A Compound B Compound C OH H Compound D How many different chemical environments (number of peaks) would you expect to see in the 'H NMR for each molecule? A = B = C = D: = Predict how many sub peaks per multiplet would be seen in the signal for the indicated hydrogen due to spin-spin splitting? A = B = C = D = How many H of that particular type (integration) would you expect to see at the indicated hydrogen? A = B = C = D= =Given the molecular formula C7H¬NO2 assign as many of the absorption bands in the spectrum below and propose a structure. (7 points)* Note you are graded on your ability to justify your answer, only 1 point is given for finding the correct structure. 1.0 0.8 80.6 0.4 -0.2 0.0아 4000 3500 3000 2500 2000 1500 1000 500 Transmittance (T) 3088 090E 2994 2954- 2932- 2864 1523 009 1349 1179- 1112- 861 792- 839- 683– 618- 741