a)  Using the molecular formula shown, calculate the elements of unsaturation for this compound. Suggest a common structure that gives rise to this number of elements of unsaturation. b)  Make a table of the chemical shift, multiplicity and number of hydrogens for each 1H-NMR signal. c)  Propose a structure consistent with the data and assign each proton in your structure to a signal in the NMR spectrum.

a) Make a table of the chemical shift, multiplicity and number of hydrogens for each 1H-NMR signal. b) Propose a structure consistent with the data and assign each proton in your structure to a signal in the NMR spectrum.

C,HBrO2, The strong peak at 1750 cm The molecular formula of an unknown compound is The proton NMR data is, 1.2d(6H, d), 4.2d(1H, t), 2.2d(2H, quintet), 4.93d(1H, septet), 1.08d(3H, t). What is the name of the unknown compound? ethyl 2-bromo-3-methylbutanoate 1-bromopropyl isobutyrate 1-bromoethyl 3-methylbutanoate Isopropyl 2-bromobutanoate

3. How many ¹H NMR signals would each of the following compounds have? Write whole integer values for your answers. #of sets of non-equivalent protons all equiv U 10. 5 Ma 3 6 Bri 6 OH * Brand (H₂ -ale

6.

Need help, please.

300 MHz 1H NMR spectra in CDCl3 are shown below for five of the six isomers of dimethylphenol. Match each spectrum to the appropriate compound and assign the resonances of the spectrum to the appropriate protons in the compound.

1. How many different sets of equivalent aromatic (benzene ring) carbons can be seen in the 13C NMR spectrum of your unknown monosubstituted benzene starting material? A. Are there any peaks for non-aromatic carbons in the 13C NMR spectrum of your unknown monosubstituted benzene starting material (yes or no)? B. If yes for part A, please list the corresponding ppm value(s) for any non-aromatic carbon(s)?

1. How many proton signals would you expect to see in the ¹H-NMR spectrum of the following molecule? For each of the proton signals, predict the splitting pattern, assuming that you can see only 3-bond splitting.

Predict how many peaks you would expect to observe in the ‘H NMR,spectrum of the compound shown below and indicate the integration value you would expect to see for each peak. Please explain how you got the answer. (It may be useful to label each hydrogen atom using lowercase letters).