135A_Practice_EXAM_4(Karty3e)_KEY(1)

Bb.84.

a. Identify A,B,C, and D in the following equations? OH OH A CH₂-CH₂ OH OH LOH H3O C D Br B b. How many signals would you expect in the 1H NMR spectrum of HOCH2CH2CH2CH2OH?\ c. The ¹H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead? d. SHow the splitting pattern of the protons in the following compound?

Deduce the structure of an unknown compound using the data. C5H₁O: 10 NMR: 69.8 (1 H, s), 8 1.1 (9 H, s) Deduce the structure of the unknown compound. Select /||||||| G C Draw Rings More Erase Q2 Q

QUESTION 9 Propose a structure for a carboxylic acid with molecular formula C6H10O2 by interpreting the following 13C NMR spectra.

For the compound given below, sketch the proton decoupled ¹3C NMR spectrum and DEPT 135 and 90 spectra. H3C. 1 2 3 (ethoxymethoxy)ethane 4 CH3 5

Please help annotate all of the spectra in the picture below, thank you so so much! It is C NMR, H NMR, and MS!

What protons in alcohol A give rise to each signal in its 1H NMR spectrum? Explain all splitting patterns observed for absorptions between 0 to 7 ppm.

Which one of the following compounds (from Figure #7) produced the 'H NMR spectrum (from Figure #8) shown below? Figure #7 inte compound A compound B compound C compound D Please click here if image does not display. Figure #8 3 203938 PPM 10 9 8 7 5 4 3 2 1 8 (ppm) Please click here if image does not display. O compound A O compound D O compound C O compound B

draw the structure of the nmr (ethyl acetate) then circle the protons on the structures and correlate the 1H's to the resonances (peaks) on the 1H NMR spectra.

Please don't provide handwriting solution

What is the 1H NMR data (chemical shift, integration, multiplicty) of hte compound shown below?

May you please help me with this ochem question?

How many signal(s) will appear in the H-NMR spectrum of toluene (structure shown below)? O5 4

punqe You will characterize your product by 'H NMR spectroscopy. How many different proton environments do you expect your product compound to exhibit? How many "C environments would you expect to see in the "C NMR spectrum? OS IS TS ES YS SS 9S LS S 6S 09 19 19 99 59 99 L9 19 69 OL IL TL EL YL SL YL LL L 6L O1 I'8 X: parts per Million: Proton

An unknown compound has the formula C10H12O. Elucidate its structure  by scrutinizing its 1H NMR spectra, shown.  Specifically, label each different type of H atom in the final structure with its NMR chemical shift in ppm.

What is the structure of the unknown? please determine it by analyzing the spectroscopic data given. thank you!

HO OH 36 HO OH Hu 350 H 5) Answer the following questions, which refer to the two diol diastereomers shown above. a) Would you expect any difference in the number of peaks in the ¹H NMR spectra of each diol? (Y or N) b) Would you expect any difference in the number of peaks in the ¹3C NMR spectra of each diol? (Y or N) c) Would you expect any difference in the integral values for the peaks in the ¹H NMR spectra of each diol? (Y or N). d) Would you expect any difference in the multiplicities for the peaks in the ¹H NMR spectra of each diol? (Y or N). e) Would you expect any difference in the chemical shifts for the peaks in the ¹H NMR spectra of each diol? (Y or N).

Br CH3 Но NH2 2 1 How many signals would you see in the 'H NMR spectrum of compound 2? 0 4 0 7 08 0 6 12 # $4 & 18 2 3 4 6. Q W R T Y 4 A S F G C

Look at NMR and answer #2,3 and 4