Name____________________________

1. The DEPT experiment on methyl ethyl ether, CH3OCH2CH3 would produce:

a) one spectrum of 3 up peaks

b) one spectrum of no peaks

c) one spectrum of one down and two up peaks

d) all of the above.

2. The signal to noise ratio is 10:1 after 1 transients. How many scans would you need to take to get a signal to noise ratio of 50:1?

3. The 90o pulse width for an instrument is 12 microseconds. If the a 48 microsecond pulse is given on the y axis, where will the magnetic vector of the nucleus (initially on the z axis) end up immediately after the pulse?.

4, 5. A 90 ^o pulse C-13 is given in the center of a CH doublet (J=140 Hz one 70 Hz upfield of rf pulse and one 70 Hz downfield of the rf pulse.) and the two magnetic vectors of the peaks end up on the + y axis. After 3.5 ms where will the two vectors be. Explain

6. A 90 ^o pulse C-13 is given in the center of a CH doublet (J=140 Hz one 70 Hz upfield of rf pulse and one 70 Hz downfield of the rf pulse.) and the two magnetic vectors of the peaks end up on the + y axis. After 7.0 ms where will the two vectors be.