Part 1 of 2Identify the isomer of CH₁ that has the 1 H NMR spectrum shown. Select the single best answer.105 H3 H1211109876543210m-xyleneO ethylbenzene○ o-xylene3,5-octadiene○ p-xylenePart 2 of 2ppmIdentify the isomer of CH C₁₂ that has the 13C NMR spectrum shown. Select the single best answer.220 200 180 160CCH₂CH3140120100806040200ppm1,2-dichlorobutaneO 1,2-dichloro-2-methylpropaneO 1,3-dichlorobutane2,3-dichlorobutaneO 1,4-dichlorobutaneG

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Answered: Part 1 of 2 Identify the isomer of CH₁…

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Section13.3: The Chemical Shift

Problem 4P: The following 1H NMR peaks were recorded on a spectrometer operating at 200 MHz. Convert each into...

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How could you use 1H and 13C NMR to help distinguish the following isomeric compounds of the formula C4H8?
Propose structures for compounds that fit the following descriptions: (a) A hydrocarbon with seven lines in its 13C NMR spectrum (b) A six-carbon compound with only five lines in its 13C NMR spectrum (c) A four-carbon compound with three lines in its 13C NMR spectrum
Assign as many resonances as you can to specific carbon atoms in the 13C NMR spectrum of ethyl benzoate.
3-Bromo-1-phenyl-1-propene shows a complex NMR spectrum in which the vinylic proton at C2 is coupled with both the C1 vinylic proton (J = 16 Hz) and the C3 methylene protons (J = 8 Hz). Draw a tree diagram for the C2 proton signal, and account for the fact that a five-line multiplet is observed.
A compound of unknown structure gave the following spectroscopic data: Mass spectrum: M+=88.1 IR: 3600 cm-1 1Î—NMR: 1.4 Î´ (2 H, quartet, J=7 Hz); 1.2 Î´ (6H, singlet): 1.0 Î´ (1 H, singlet); 0.9 Î´ (3 H, triplet, J=7 Hz) 13CNMR: 74, 35, 27, 25 Î´ (a) Assuming that the compound contains C and H but may or may not contain O, give three possible molecular formulas (b) How many protons (H) does the compound contain? (c) What functional groups(s) does the compound contain? (d) How many carbons does the compound contain? (e) What is the molecular formula of the compound? (f) What is the structure of the compound? (g) Assign peaks in the moleculeâ€™s 1HNMR spectrum corresponding to specific protons.
The 1H and 13C NMR spectra of compound A, C8H9Br, are shown. Propose a structure for A, and assign peaks in the spectra to your structure.
Compound F, a hydrocarbon with M+=96 in its mass spectrum, undergoes reaction with HBr to yield compound G. Propose structures for F and G, whose 13C NMR spectral data are given below. Compound F Broadband-decoupled 13C NMR: 27.6, 29.3, 32.2, 132.4 DEPT-90: 132.4 DEPT-135: positive peak at 132.4 ; negative peaks at 27.6, 29.3, 32.2 Compound G Broadband-decoupled 13C NMR: 25.1, 27.7, 39.9, 56.0 DEPT-90: 56.0 DEPT-135: positive peak at 56.0 ; negative peaks at 25.1, 27.7, 39.9
How could you use 1H NMR, 13C NMR, and IR spectroscopy to help you distinguish between the following structures?
When measured on a spectrometer operating at 200 MHz, chloroform (CHCl3) shows a single sharp absorption at 7.3 Î´. (a) How many parts per million downfield from TMS does chloroform absorb? (b) How many hertz downfield from TMS would chloroform absorb if the measurement were carried out on a spectrometer operating at 360 MHz? (c) What would be the position of the chloroform absorption in Î´ units when measured on a 360 MHz spectrometer?
A 13C NMR spectrum is shown for a molecule with the molecular formula of C4H8O2. Draw the structure that best fits this data.
Find the structure for each NMR spectra. If it helps the MS peak is 329
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