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Lesson: Functional Groups in UVโ€“Vis Spectra

Worksheet • 6 Questions

Q1:

In general, when calculating empirical values for ๐œ† m a x , what is the result of adding a substituent group?

  • AA bathochromic shift
  • BA hypsochromic shift
  • CA hypochromic effect
  • DA hyperchromic effect

Q2:

Which of the following would result in a hypsochromic shift in the UV spectra?

  • ASaturation of a double bond
  • BDehydration of an alcohol to form a double bond
  • CAddition of an amino group
  • DCyclization of an aliphatic compound

Q3:

The method of continuous variations, also known as Jobโ€™s method, uses the intersection of the ligand-line and the metal-line to determine which of the following?

  • AThe mole ratio between the metal and ligand in a complex.
  • BThe oxidation number of the metal.
  • CThe concentration at which the detector can no longer respond to the signal.
  • DThe number of dimeric molecules formed.
  • EThe maximum intensity of source photons transmitted.

Q4:

What does increasing conjugation in a series of analogous compounds results in?

  • ABathochromic shift
  • BHypsochromic shift
  • CHypochromic effect
  • DHyperchromic effect

Q5:

Why does increased conjugation cause a shift to higher wavelengths?

  • AIt decreases the distance ( ฮ” ๐ธ ) between the HOMO and LUMO levels.
  • BIt increases the distance ( ฮ” ๐ธ ) between the HOMO and LUMO levels.
  • CIt changes the types of electronic transitions available from ๐œ‹ ๐œ‹ - โˆ— to ๐‘› ๐œ‹ - โˆ—
  • DIt causes the vibrational and rotational levels of the molecules to become excited.

Q6:

Which of the following is true of the Woodward-Fieser Rules for conjugated carbonyl compounds?

  • AInclude a solvent correction value
  • BAre the same as the rules for dienes
  • CCan also be applied to benzene derivatives
  • DOnly include substitutes directly adjacent to the carbonyl group
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