In this worksheet, we will practice identifying functional groups in a compound by assessing the shapes and positions of peaks in UV–Vis spectra.
The method of continuous variations, also known as Job’s method, uses the intersection of the ligand-line and the metal-line to determine which of the following?
- AThe maximum intensity of source photons transmitted.
- BThe concentration at which the detector can no longer respond to the signal.
- CThe number of dimeric molecules formed.
- DThe mole ratio between the metal and ligand in a complex.
- EThe oxidation number of the metal.
Which of the following would result in a hypsochromic shift in the UV spectra?
- ACyclization of an aliphatic compound
- BDehydration of an alcohol to form a double bond
- CAddition of an amino group
- DSaturation of a double bond
What does increasing conjugation in a series of analogous compounds results in?
- AHyperchromic effect
- BHypsochromic shift
- CHypochromic effect
- DBathochromic shift
Why does increased conjugation cause a shift to higher wavelengths?
- AIt causes the vibrational and rotational levels of the molecules to become excited.
- BIt increases the distance between the HOMO and LUMO levels.
- CIt changes the types of electronic transitions available from to
- DIt decreases the distance between the HOMO and LUMO levels.
Which of the following is true of the Woodward-Fieser Rules for conjugated carbonyl compounds?
- AOnly include substitutes directly adjacent to the carbonyl group
- BAre the same as the rules for dienes
- CCan also be applied to benzene derivatives
- DInclude a solvent correction value
In general, when calculating empirical values for , what is the result of adding a substituent group?
- AA hyperchromic effect
- BA hypsochromic shift
- CA hypochromic effect
- DA bathochromic shift