9. Consider the reaction shown below in which the radical cation C loses a methyl radical D to generate a cation E. D (i) Which, if any, of the species will be detected by the mass spectrometer? (ii) What percentage of the M" peak will the M" be for each of the detected species? +1 peak +2 (iii) What percentage of the M' peak will the M" peak be for each of the detected species?
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- The base peak in the mass spectrum of hexanamide appears at m/z = 59. Draw the ion that corresponds to this mass peak, and show how it is produced from the molecular ion.14. predict the product of the raction below. Which of the following change(s) in the IR spectrum is consistent with conversion of the reactant to productThe alkene C8H8 was made when reacting an unknown carbonyl compound with methylene phosphonium ylide. The IR and mass spec for the unknown carbonyl compound and C8H8 are attached. Which spectrum is associated with which compound , and how do important peaks indicate this?
- 7 Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the followingcompounds. 4-methylpentan-2-olWhich of the following molecules matches the given data? (Note: All the molecules have a M+ = m/z 102) C5H10O2 base peak = m/z 43this is mass spectrum.a. Methylcyclohexaneb. 2-Methyl-pentenec. 2-methtl-2-hexanold. ethyl isobutyl ether which is each proper structure?what is each peak mean ?How molecular ion to transfer eacg fragment?
- Write molecular formulas for compounds that show the following molecular ions in their high-resolution mass spectra, assuming that C, H, N, and O might be present. The exact atomic masses are: 1.007 83 (1H), 12.000 00 (12C), 14.003 07 (14N), 15.994 91 (16O). (a) M+=98.0844 (b) M+=123.0320Label base peak and molecular ion peak C4H10OTake a look at the reaction in the first image that give two products A and B The second picture shows the DEPT 90 (TOP) and DEPT 135 (BOTTOM) of the compound that was isolated as only product of this reaction: In both spectra there are 7 signals between 120 and 140 ppm. How can you use these DEPT spectra to establish if product A or product B was formed in this reaction? Explain your reasoning.
- Q1. Why is it common to use CCl4 as a solvent in IR spectroscopy? Q3. After completion of the previous reaction, you end up seeing the following peaks: 3300 cm-1 (broad intense peak), 3060-3040 cm-1 (2 medium intensity peaks), 3030-3020-3010 cm-1 (3 small peaks), 1640 cm-1 (low intensity peak), 1585 cm-1 (medium intensity peak), 1410 cm-1 (medium intensity peak), 1100 cm-1 (strong intensity peak), 1010 cm-1 (medium intensity peak), 900-690 (many peaks, medium intensities). Give the molecular structure of the actual final product for the previous reaction. (Hint: it is not a carboxylic acid, nor the ketone previously drawn.) Q4. You want to take the IR spectrum of acetylene. How would you prepare your sample? Mention all important details of the sample preparation (no need to describe the acquisition).Th emajor fragmentation of the following molecule occurs through the Mclafferty rearrangement . which of the following is expected to be the base peak in the mass spectrum? I cleaved the compound on the bonds adjacent to the alpha and calculated the mass for the biggest fragment, which was m/z= 73. The answer is actually m/z = 86. Can someone give me a step by step on how to do this problem?Show a structure of the fragment in the mass spec producing the base peak (139 m/z) and a structure for the fragment that was lost.