20 for acquiring a \'H NMR 3D Which of the following is not a common solvent use
ID: 229113 • Letter: 2
Question
20 for acquiring a 'H NMR 3D Which of the following is not a common solvent used A) CDCh 8) CCl ey Do 'H NMR spectrum? of the following is true about the area under each signal in a A) it indicates the number of neighboring protons B) it indicates the electronic environment of neighboring protons C) it indicates the number of different protons D) i 21. Whic t indicates the electronic environment of absorbing protons E) it indicates the relative number of protons in the signal 22. Which of the following type of protons are chemically non-equivalent? A) homotopie- Bl enanttotopic C) diastereotopic D) A & B E) B & C 23. Protons H, and Hb in the following compound are . A) homotopic B) enantiotopic C)) diastereotopic mesotopic E) none of these Protons H, and Ho in the following compound are Br 24. A) homotopic B) enantiotopic C) diastereotopic D) mesotopic E) none of these Hb 25. How many signals would you expect in the 'H NMR spectrum of the following compound? A) 4 B) 5 C) 6 D) 7 E) 8 4I PS 3Explanation / Answer
20)
Ans: D) CH3OH
Most of the NMR spectra are recorded in a deuterated solvent to stay away from the spectra dominated by the solvent signal. CDCl3, CD3CN and D2O are deuterated solvents and in CCl4 has no protons so we can these solvents to record NMR.
21)
Ans: C) It indicates the different kinds of protons
By looking NMR spectra we can tell how many different types of protons present in the molecule.
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