Name____________________________

1. Nuclear Overhauser Effect, n.o.e., is:

a) the name given to the reason magnetic moment preccess in a magnetic field.

b) the effective coupling between one nuclei and a neighboring nuclie

c) the enhanced intensity one gets in a C-13 spectrum when the H attached to it is decoupled.

d) the effect one gets by giving a nuclei a 180 degree pulse.

2. When a decoupled C-13 spectrum is run on a 200 mega Hertz instrument;

a) what frequency is the sample irradiated with continuously?

b) at what frequency is the sample pulsed?

3. A J³_H-H coupling constant is generally around ___ Hz.

a) 0.7 b) 7 c) 70 d) 700 e) 7000

4. A J¹_CH coupling constant is generally around ___ Hz.

a) .15 b) 1.5 c) 15 d) 150 e) 1500

5. For a proton spectrum on a 60 MHz instrument, 1 ppm corresponds

to ____ Hz.

6. Sketch the coupled (non decoupled) C-13 spectrum you would expect for ethylchloride, CH₃CH₂Cl.