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Lily Ponsi

Lily P.

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ANSWERED

Shalini Tyagi verified

Numerade educator

Which one of the following isomeric compounds could be distinguished from the others based on the number of signals observed in its 13C NMR spectra? Choose one: A. B. C. D.

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ANSWERED

George Bennett verified

Numerade educator

An unknown compound has the molecular formula C7H14O, and its 1H NMR and 13C NMR spectra are shown here. Determine the structure of the unknown compound and draw it below. Note that there are no peaks above 3 ppm in the 1H NMR, and the numbers present on the 1H NMR are the integration values for each set of peaks. (Also note that the protons responsible for causing the splitting pattern seen for the "9 peak" multiplet have similar coupling constants.) Andrés M. Castillo, Luc Patiny and Julien Wist. Fast and Accurate Algorithm for the Simulation of NMR spectra of Large Spin Systems. Journal of Magnetic Resonance 2011. 1H Spectrum 13C Spectrum

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ANSWERED

George Bennett verified

Numerade educator

Draw the structure of molecular formula C8H10O that produced the 1H NMR spectra shown below. The IR spectrum does not show a broad absorbance at 3300 cm-1 or a strong absorbance at 1710 cm-1. doublet 2h doublet 2H singlet 3H singlet 3H ppm

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ANSWERED

George Bennett verified

Numerade educator

Describe the spin-spin splitting patterns expected for protons 1, 2, and 3 of the following compound: also do it for H2 & H3 Part 1 (0.3 pt) Select the correct splitting pattern for H1. Choose one: A. doublet of triplets B. triplet C. doublet of doublets D. triplet of triplets

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ANSWERED

Ivan Kochetkov verified

Numerade educator

Match the molecules below with the expected chemical shift of the methyl group protons: Items (4 images) (Drag and drop into the appropriate area below) HO-CH3 H3C-CH3 H-C(=O)-CH3 F-CH3 Categories 0.9 ppm 2.1 ppm 3.3 ppm 4.1 ppm

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ANSWERED

Ivan Kochetkov verified

Numerade educator

Enter the number of signals for C. signals

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ANSWERED

Ivan Kochetkov verified

Numerade educator

How many signals would you expect to find in the proton-decoupled 13C spectra of the following isomeric compounds? Part 1 (0.3 pt) CH3CH2 CH3CH2 Enter the number of signals for A. signals Part 2 (0.3 pt) CH3CH2 CH2CH3 Enter the number of signals for B.

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INSTANT ANSWER

On the vitamin A structure shown below, rank the indicated carbons in order from highest \( { }^{13} \mathrm{C} \) NMR chemical shift to lowest chemical shift. Question List (4 items) (Drag and drop into the appropriate area) v w U X Chemical Shift

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Sanchit Jain verified

Numerade educator

Choose each hydrogen that does not fall into one of the above categories. Choose one or more: Ha Hb Hc Hd He

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INSTANT ANSWER

Part 2 (0.3 pt) Choose each hydrogen that would appear as a doublet. Choose one or more: Ha Hb Hc Hd He Part 3 (0.3 pt) Choose each hydrogen that would appear as a doublet of doublets. Choose one or more: \( \mathrm{Ha}_{\mathrm{a}} \) Hb \( \mathrm{H}_{\mathrm{c}} \) Hd He

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