Pa III (Pr) CA II
Uv Visible Spectroscopy
- 1.Beer’s Law (or the Beer-Lambert Law) is . . .
- A.
A linear relationship between the intensity of a UV absorbance and the concentration of the analyte.
- B.
An inverse relationship between the IR stretching frequency and the energy of light.
- C.
An inverse relationship between the IR stretching frequency and the energy of light.
- D.
Used to derive a molecular formula from the mass-to-charge ratio of an analyte.
- 2.Which of the following wavelength ranges is associated with UV spectroscopy?
- A.
0.8 - 500µm
- B.
400 - 100nm
- C.
380 - 750nm
- D.
0.01 - 10nm
- 3.Which of the following compounds does not absorb light in the UV/visible spectrum?
- A.
Aspirin
- B.
Paracetamol
- C.
Chloral hydrate
- D.
Phenobarbitone
- 4.In UV absorption spectroscopy, which of the following statements are true?
- A.
σ→σ* transitions are lower in energy than π→π* transitions
- B.
A conjugated systems of double bonds in a molecular shifts the a absorption maxima to higher wavelengths
- C.
σ→σ* transitions are higher in energy than π→π* transitions
- D.
B and C
- 5.A compound X is characterized in its electronic spectrum by an absorption with λmax = 217 nm (εmax = 21 000 dm3 mol–1 cm–1). Of the compounds given below, X is most likely to be:
- A.
Buta-1,3-diene
- B.
β-carotene.
- C.
Ethanol.
- D.
Water.
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