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- a. How many signals are in its 13C NMR spectrum?b. Which signal is at the lowest frequency?a) Annotate the 1H NMR spectra a) Annotate the labeled peaks in the IR spectra a) Annotate the UV-Vis spectraHow does the operating frequency in NMR spectroscopy compare with the operating frequency in IR and UV/Vis spectroscopy?
- From the spectra, determine the structure of the molecule.Remember to ignore the triad in the 13 C NMR spectrum at 77 ppm thatcomes from the NMR solventHow many (total) 13C NMR signals should be expected for this amine? b. Which one should be the farthest downfield (left) in the spectrum?Draw the structure of 2-butanol on the NMR spectrum and assign each peak to the orressponding hydrogen atoms on the molecule.
- how to determine the multiplicity of each signal in the expected 1H NMR spectrumHow many signals are present in the 1H NMR spectrum for each molecule? What splitting is observed in each signal?For the following compounds (a) predict the number of 1H NMR signals, and (b) list the integration ratio of the signals.
- 1.Assign an appropriate structure (B and C) to each spectrum (l and II) below. Briefly explain your answer. 2.Assign the proton signals of compound B and C in the 1H NMR spectrum respectively, based on your answer in 1.Using a 300 MHz NMR instrument: a.How many Hz downfield from TMS is a signal at 2.5 ppm? b. If a signal comes at 1200 Hz downfield from TMS, at what ppm does it occur? c.If two signals are separated by 2 ppm, how many Hz does this correspond to?Predict the chemical shift and spiting pattern of each of the signals in the 1H NMR spectrum and sketch the spectrum of compound A above.
