Refer to the mass spectrum of 2-methylbutane shown below to answer the followingquestions.a.What peak represents M*?10080-Relative Intensity004060-200-1010MS-14-34482030405060708090100110120m/zb. What peak represents the base peak?c. Propose structures for fragment ions at m/z = 57, 43, and 29.

Answered: Refer to the mass spectrum of…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL2: Mass Spectrometry

Section: Chapter Questions

Problem 3E

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Following is the mass spectrum of an unknown compound. The two highest peaks are at m/z 120 and 122. Suggest a structure for this compound. (Data from http://webbook.nist.gov/chemistry/.)
Please don't provide handwritten solution ....
Determine the molecular ion peak in the mass spectra below.
Im a bit confused with organic chemistry spectra material. How do I solve this step by step?
FRAGMENTS MISSING, THANK YOU!
1. Draw the sketal structure from the mass spectrometry chart given
1. The two mass spectra below correspond to two isomers of C5H10O2: methyl butanoate and valeric acid. Match the spectrum with the appropriate compound. Place the m/z ratio and the structures (show all atoms) for the labeled fragments in the table below. 100 - Compound MS-NU-1708 Methyl butanoate 80 - 1 60 - 40 - CH3 2 H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z 100 - Compound MS-NU-3125 3 80 - Valeric acid 60 - 4 40 - H3C 20 - 10 20 30 40 50 60 70 80 90 100 m/z Fragment 1 Fragment 2 Fragment 3 Fragment 4 m/z 74 87 Fragment Relative Intensity
1. Given the IR and MS spectra, identify the following unknown with molecular formula (C5H10). 0.9 0.75 0.6 0.45 3089 2975 3000. 1648 2000. WAVENUMBER (cm-1) 885 1000. 100.- 80. 60.- 40.- 20. 0. 0. 15 15. d. Propose a structure consistent with this information. 29 c. To what do MS fragments at m/z = 70, 55, and 29 correspond? 30. m/z a. Calculate the hydrogen deficiency index for the molecule (show your work). 45. b. To what do the IR absorptions at 3089, 2975, 1648, and 885 cm³¹ correspond? 60. 70 75.
23. Consider the mass spectrum of hexane. Relative Intensity 100 80 60 40 20 O a. b. C. d. e. f. g. 10 MS-NW-5505 50 m/z Label the [M] peak. What is the value of m/z associated with this peak? 20 30 40 60 70 What is the mass of a hexane molecule that contains six ¹2℃ atoms (¹2CH3-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH₂-¹2CH3)? Does this fit with the m/z value reported in part a of this question? 80 Draw a picture, like the one of "all ¹²C hexane" above, of a molecule that can account for the existence of a peak at m/z = 87 in the mass spectrum of hexane. (Check your work.) There are actually three acceptable answers to the previous question because there are three unique locations in a hexane molecule to replace a ¹2C with a ¹3C. If you have not already done so, draw the other two acceptable answers to the previous question. The peak at m/z = 87 is called the [M+1]* peak. Construct an explanation for this name. Use your periodic table to calculate the weight, in grams, of 1 mole of hexane to four…
D
Determine the molecular formula and possible structures for the unknown based on the spectra given. Label the characteristic stretches on the IR. Label the molecular ion peak and the base peak on the mass spectrum.
The two mass spectra below correspond to two isomers of C5H10O. Match the spectrum with the compound and draw the fragment ion that corresponds to the base peak.

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