23FA262_Lesson_01_Course and NMR Intro_post-class-21

In this structure, which hydrogen has the higher chemical shift and why?

Match the chemical shifts with the letter of the absorbing protons 4.0 = 2.3 = 1.6 = 1.1 = 0.95 = A/ N A/

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Using the following spectra and other information provided, identify the compounds, and all pertinent peaks are assigned in the spectra (correct compound, labeling proton spectrum, labeling carbon spectrum) Label the peaks on the spectrum and place the structure of the compound in the box on the right side of the spectrum.

How many 1H and 13C signals ?

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Question 6 In the mass spectrum the highest peak is known as the base peak is also considered as the parent peak. O True O False

Part E Approximate chemical shift for groups a, b, and c (note the order in the image). a H На b c -OCH,CH3 b CH;CH,O- a H На O 2.3, 0.9, 2.3 O 2.3, 3-4, 0.9 O 7.2, 3-4, 2.3 O 7.2, 3-4, 0.9 Submit Request Answer Part F What are the splitting values for groups a, b, and c (note the order in the image). a H На b c OCH,CH3 с b CH;CH,O- a H На O singlet, quartet, triplet doublet, triplet, quartet O singlet, doublet, triplet O singlet, triplet, doublet Submit Request Answer

Rank the labeled protons in order of increasing chemical shift.

Question 3 What is the correct order of operations related to NMR that yields a spectrum? 1 st Step [Choose ) [Choose A pulse is used to align spins perpendicular to the magnetic field Spins of atoms relax towards the alignment with the magnetic field Sample is loaded into the bore of the magnet Spins align orthogonally to the magnetic field. 2nd Step 3rd Step [Choose ] 4th Step [ Choose ] Question 4 A primary benefit of NMR spectroscopy is that it is a non-destructive technique and multiple measurements can be obtained for a single sample. True O False

1 120 30. Label the base peak and the Mt peak in the following mass spectrum.

3. Homework Help

D Question 5 For a 2D spectrum with 5 peaks on the diagonal, how many off- diagonal peaks are expected а. 1 O b. 2 с. 3 d. 4

1- The number of the signals for the following compound in DEPT-90 experiment will be: (a) 1 (b) 2 (c) 3 (d) 4

Dr Lamia Q 17 Answer all the following questions: 1/ 1 my has values of: -3, -1, 0, 1,2, and 3, write down the corresponding value of .

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Given these compounds, what would the chemical shifts look like? Predict them for each compound

Which is the PES spectrum for oxygen, O? Number of Electrons Number of Electrons O a. A Ob. B O c. C O d. D A 100 10 lonization Energy (MJ/mol) C 100 10 lonization Energy (MJ/mol) Number of Electrons Number of Electrons B 100 10 lonization Energy (MJ/mol) D 100 10 lonization Energy (MJ/mol) 1 1 1 1

what are the epr spectrum looks like for these two different type? cl CI PET THC cl PET PET Pet cl Viel et ct

A compound has a molecular mass of 120.0 g/mole what are the masses that you expect to see in the MS spectrum if you run positive ion mode ESI-MS for this compound: Select one: O a. 120 only O b. 120 & 121 O c. 120 & 119 O d. 121, 61 & 41 O e. 121, 244 & 369

Select all true statement(s) about the number of the signal in a ¹H NMR spectrum. the absolute number of protons in that signal | resonant frequency of the observed protons relative to a standard in a magnetic field the relative number of protons in that signal different type of protons based on their chemical environment chemically non-equivalent protons within a molecule the number of neighboring protons

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