Pa III (Pr) CA II

5 Questions | By Talkwithrajats | Last updated: Mar 14, 2022 | Total Attempts: 78

Uv Visible Spectroscopy

Questions and Answers

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 λ_max = 217 nm (ε_max = 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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