SIC2024/SIC2007 & SQC7006 week 3

H-1 and C-13 nuclei have a property called

• Stretch

• Bend

• Spin

• Rotate

What is the nuclear quantum number for H-1 nuclei?

• 5/2

• 1

• 1/2

• 1/3

what is the number of allowed spin state for H-1 and C-13?

• 3

• 2

• 1

• 0

What is Bo?

• Resonance energy

• Radiofrequency wave

• External magnetic field

• Boltzman

Nuclear spin + ½ in Bo is refers to nuclei

• spin clockwise & aligned against Bo

• spin clockwise & aligned with Bo

• spin anti-clockwise & aligned against Bo

• spin anti-clockwise & aligned with Bo

What is the source of resonance energy for NMR?

• infrared radiation

• Ultraviolet radiation

• collision of molecules

• radiawave

what is the role of tetramethylsilance (TMS) in running NMR experiment?

• No idea

• sample

• solvent

• reference

How many type of structural information can be obtained from H-1 NMR spectrum?

• 0

• 3

• 4

• 5

what is electron shielding?

• electron is surrounded by nucleus density

• electron is surrounded by proton density

• nucleus is surrounded by nucleus density

• nucleus is surrounded by electron density

The greater the electron density,

• the greater the deshielding effects

• the greater the shielding effects

• chemical shift of proton is not affected

• I don't know!!!