Question 1
The
1H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead?
◦ 7.5 ppm
◦ 6.8 ppm
◦ 3.5 ppm
◦ 5.8 ppm
◦ none of these
Question 2
________ is used as a reference for recording NMR spectra and is assigned a chemical shift value of zero.
◦ Benzene
◦ CCl
4◦ CCH
4◦
13C
◦ Tetramethylsilene