UV-VIS spectrum of lycopene shows four peaks located at 420 nm, 444 nm, 470 nm and 500 nm: 0.7 470 BIn 0.6 444 nm S00 Bm Abs. 0.4 420 nm 0.2 400 450 s00 550 Wavelength (nm) Questions: 1) Please, calculate the lambda max for the structure of all-trans-lycopene; 2) Compare your calculation with UV/Vis spectrum obtained by your TA. Why did you get 4 to 5 different signals instead of one that you have calculated? 3) Why tomato and tomato paste are red colored?

UV-VIS spectrum of lycopene shows four peaks located at 420 nm, 444 nm, 470 nm and 500 nm: 0.7 470 BIn 0.6 444 nm S00 Bm Abs. 0.4 420 nm 0.2 400 450 s00 550 Wavelength (nm) Questions: 1) Please, calculate the lambda max for the structure of all-trans-lycopene; 2) Compare your calculation with UV/Vis spectrum obtained by your TA. Why did you get 4 to 5 different signals instead of one that you have calculated? 3) Why tomato and tomato paste are red colored?

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter20: Dienes, Conjugated Systems, And Pericyclic Reactions

Section20.3: Uv-visible Spectroscopy

Problem 20.5P

See similar textbooks

Similar questions

Propose a structure consistent with each set of data. a.C9H10O2: IR absorption at 1718 cm−1b.C9H12: IR absorption at 2850–3150 cm−1
Complete the following answer using the data provided here: Molecular formula: C4H8O2 Important IR data (cm-1): 3280 (broad); 2980-2730 (many); 1690; 1254 All 1H NMR data (ppm, splitting, integration): 11.0 ppm (s), 1; 2.57 ppm (m), 1; 1.07 ppm (d), 6 1. Sketch out a 1H NMR spectrum showing peak locations and peak splitting on a ppm scale for the data provided above. Include the data labels above in your spectrum, but do not show integration lines. 2. draw the most proper line bond structure for the data given above
2) Figures 2 to 4 show the IR, 1H NMR and 13C NMR spectra of a compound with formula C3H5N 2a) Identify bands A and B in the IR spectrum 2b) Using the information from the 1H NMR spectrum, fill in the table below Peak cluster (ppm) Multiplicity Number of H in neighbouring C Proposed identification 0 1.30 2.35 2c) Propose a structure for the compound C3H5N. Justify your answer by referring to key spectral features of the 3 spectra.
Identify the Brassicasterol peak of the GC-MS of Burn Morel mushrooms (Tomentosa) and the M (+/-) peaks that are present. Include the mass and signature intensities of the peaks main product.
Using the attached infrared spectroscopy spectrum for the compound Tetrahydrofuran, identify the functional group and any observed characteristic absorbtions in cm-1. Compare with the attached roadmap for interpreting IR spectra.
Assign the IR spectra given in Questions 1 - 3 to their corresponding structures from the ones below. The number in parentheses next to each possible answer corresponds to the structure's Chemical Abstracts Services (CAS) number. 1-bromobutane (109-65-9) 1-cyclopropylethan-1-one (765-43-5) 1-ethyl-3-methylbenzene (620-14-4) 1,2-dimethoxynenzene (91-16-7) 2,3-dimethylbutan-2-ol (594-60-5) 3-methylbutan-1-ol (123-51-3) 3,3-dimethylbutan-2-one (75-97-8) 4-benzylpiperidine (31252-42-3) 4-methoxybenzaldehyde (123-11-5) acetic anhydride (108-24-7) acetonitrile (75-05-8) acetyl chloride (75-36-5) anisole (100-66-3) benzaldehyde (100-52-7) benzoic acid (65-85-0) benzophenone (119-61-9) benzyl acetate (140-11-4) bromobenzene (108-86-1) cyclohex-2-en-1-one (930-68-7) cyclohexanone (108-94-1) cyclopent-2-en-1-one (930-30-3) diethylamine (109-89-7) dimethyl malonate (108-59-8) ethyl 2-cyanoacetate (105-56-6) ethynylbenzene (536-74-3) heptanoic acid…
If you are setting up a standard curve using a UV spectrophotometer and a set of standards, and your unknown sample gives an absorbance value higher than your most concentrated standard. What would need to be done to accurately calculate the unknown sample concentration? I humble request to you please give the answer within 1 hrs so that I do my work.
Chemistry This IR spectrum demonstrates constitutional isomers containing the same molecular formula of C8H8O2. This spectra could correspond to methyl benzoate or the other 2 possible constitutional isomers. Please identify the correct structure for this IR spectrum and interpret the spectrum according to the medium-strong peaks displayed. Please be organzied, write neatly, or type up the answer. Thank you.
Convert the following infrared wavelengths to cm-1. 5.85 mm, typical for a ketone carbonyl
N-propylbenzene, C6H5CH2CH3, contains C (sp3) -H and C (sp2) -H bonds. Its IR spectrum shows strong or medium absorptions at 3085, 3064, 3028, 2960, 2931 and 2873 cm ^ -1, as well as bands below 1600cm -1. Which statement is wrong? A.) Stretching of the C (sp3) -H bonds results in absorptions at lower wave numbers than the stretching of the C (sp2) -H bonds. B.) The absorptions at 2960, 2931 and 2873 cm ^ -1 are assigned to stretching of the C (sp3) -H bonds. C.) The absorptions at 3085, 3064 and 3028 cm ^ -1they are assigned to stretching of the C (sp2) -H bonds. D.) Each absorption can be assigned to the stretch mode of a particular bond in the propylbenzene molecule.
The IR and 1H NMR spectra of an unknown molecular formula C8H15NO2 are shown below. The following questions will guide you in determining its structure. 1.Determine the degree of unsaturation. Show your calculation.2.Analyze three significant bands in the IR spectra and conclude on the existing functions.3.Analyze the 1H NMR chart below Draw the final structure of the unknown
Calculate the DoU for structures shown. Use spectral data to identify the four unknowns. You must provide structure of the unknown and provide information used to elicit the structure, ie. chemical shifts of protons, wavenumbers for functional groups and parent peak mass for molar mass of each compound. provide an explanation for any work shown or drawn on your spectals. You must provide the name draw the structure of each which you propose