Practice Exam I - Ocred

13 The mass spectra of heptane and 2,2,3-trimethylbutane are given below. Which spectrum represents which compound? Explain. 100 MASS SPECTRUM 80 60 - 40 - 20 0.0+ 0.0 20 40 60 80 100 120 m/z NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) MASS SPECTRUM 100 80 60 40 20 100 120 80 0.0 40 60 20 0.0 m/z NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) Rel. Intensity

Which compound corresponds to Rf = 0.55?   Choose one: Need to run reference standards to compare. 1   2   3

What is the structure and functional group of the unknown, below? Explain how you determined it.

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Answer last 3

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14. Which reagents above are used for transforming alcohols?

12. List the reagents that generate a carbocation intermediate.

lentActivity.do?locator=assignment-take [Review Topics] [References] References to access important values if needed for this ce the following reaction by writing the name of the H₂ CH₂CH₂ CH₂CH₂CCH₂CH₂ t Answer 41 + Retry Entire Group Ni or Pt 9 more group attempts rema

Write the molecular formula that is consistent with the following mass spectral data (e.g. C4H10). Leave no blank spaces. M*• at m/z = 84, relative height 10.0% %3D (M+1)*• at m/z = 85, relative height = 0.56% %3D

Which functional groups are easy to miss in mass spectrometry? Explain your answer

3. ( What structures correspond to theses peaks? Show your reason. OMO m/z 97 m/z 85 m/z 73

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1. Which one of the given compounds is consistent with the mass spectrum below? 100 40 20 10 20 25 30 35 40 5o 55 45 60 65 70 75 m/z Courtesy of SDBS: National Institute of Advanced Industrial Science and Technology A. CH,CH,CH(CH,), В. CH,CHOHCH,CH, C. CH,CH,OCH,CH, D. CH,CH,NHCH,CH, E. CH,CH,CH,CH, Relative htensity

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Assign each mass spectrum to the molecule on the list. Write down the molecule that corresponds to the main fragments. 1. 60 80 100 0 20 80 m/z B. Jadi 71 100 0 20 00 10 40 miz m/z D. MY. -Taut A. C. 8 2

Please answer 1D.  how would the Rf values change if eluted with hexanes using an alumina TLC plate? I think that an alumina plate is more polar than a silica plate, so I am inclined to say that this would increase the Rf values. But, I also know that hexanes are non-polar, so I am not sure if they would move up a very polar surface or not. Thanks!

Kindly identify the three remaining fragments and explain the process. The first three fragments are already given with explanations but i simply do not understand. Kindly answer the highlighted part. Thank you

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Benzoic acid produced which of the following mass spectra? Unknown A Unknown B MASS SPECTRUM 100 MASS SPECTRUM 100 80 80 60 60 40 40 20- 20- 0.0 0.04 20 0.0 40 120 - 80 m/z 160 40 60 a0 .m/z 100 120 140 NIST Chemistry WebBook (http://webbook.nist.gov/chemistry) NIST Chemistry WebBook thetp://webbook.rist.goulchemistry) Unknown D Unknown C MASS SPECTRUM MASS SPECTRUM 100 100 80 80 60 60 40 40 20 20 0.0 0.0 20 40 60 80 100 120 0.0 40 80 120 160 200 m/z m/z NIST Chemistry WebBook (http://webbook.nist.gov/chemistry) NIST Chemistry Weblook thetp//webbook.rist.govichemistry) Re htensty Rel. Intensity

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Is the compound giving rise to the mass spectrum shown here more likely to contain sulfur, bromine, or chlorine? Explain. 100 80 - 60- 40 20 40 80 120 160 m/z Relative abundance -유

Rel. Intensity MASS SPECTRUM 100- 80- 60- 40- 20- 0.0- 20 40 60 80 100 120 m/z The compound contains chlorine. The compound contains bromine. ○ The compound contains both bromine and chlorine. O The compound contains only carbon, hydrogen, and oxygen. ○ The compound contains only carbon and hydrogen.