Question

MetroPCS Wi-Fi 8:41 AM Done Attachment (3 points each) Circle the best answer. 1. A nucleus with an atomic number or an atomic mass has a nuclear spin that can be observed by t he NMR spectrometer. a. odd, odd b. even, even d. odd, even c. even, odd 2. In H NMR, how many nuclear spin states are allowed for the H nucleus? a. b. 3 d. 1 3. Electromagnetic radiation in the used in H NMR spectroscopy rcgion is a. infrared b. microwave c. radio wave d, ultraviolet 4. H nuclei located near electronegative atoms tend to be relative to the H nuclei which are not located near an electronegative atom. a. deshielded b. shielded C. d. None of the above 5. Teramethyl silane is commonly used asa NMR spectroscopy because its chemical shift is assigned to be 0.0 ppm a. decoupler b. coupling constant reference d. None of the above 6. What is the approximate chemical shift for a ketone carbonyl in "C NMR spectroscopy? c. 100 ppm a. 200 ppm 50 ppm b. 150 ppm d.

Answer 1

ANSWERS:

1. option C - even atomic number, odd atomic mass (and odd atomic number and odd atomic mass also NMR active)
2. option C - 2 spin states are possible for ¹H because I = 1/2 for ¹H.
3. option C- radio waves.
4. option A- deshielded
5. option C- reference
6. option A - 200 ppm