6) This question is concerned with vibrational spectra (Infrared and Raman). a) How many normal modes of vibration are expected in these molecules? (Show calculations) i) Theobromine (the caffeine-like stimulant that is found in chocolate) b) In the molecular vibration shown here for trans-1,4-dichlorocyclohexane, both chlorine atoms stretch away from the carbon to which they are bonded (arrows). Will this mode be IR active? Will this mode be Raman active? In each case, why or why not? ii) Cyanopolyyne (an organic molecular wire that has been detected spectroscopically in interstellar space, and is postulated to be a precursor to biomolecules: HC=C-C=C-C=N c) Why are CH4 and CO₂ considered greenhouse gases, but O₂ and N₂ are not? d) Are the vibrations shown here a degenerate pair (Yes/No)? Why or why not? HN CI CH3 ci↑ ∙H -F CH3 -F
6) This question is concerned with vibrational spectra (Infrared and Raman). a) How many normal modes of vibration are expected in these molecules? (Show calculations) i) Theobromine (the caffeine-like stimulant that is found in chocolate) b) In the molecular vibration shown here for trans-1,4-dichlorocyclohexane, both chlorine atoms stretch away from the carbon to which they are bonded (arrows). Will this mode be IR active? Will this mode be Raman active? In each case, why or why not? ii) Cyanopolyyne (an organic molecular wire that has been detected spectroscopically in interstellar space, and is postulated to be a precursor to biomolecules: HC=C-C=C-C=N c) Why are CH4 and CO₂ considered greenhouse gases, but O₂ and N₂ are not? d) Are the vibrations shown here a degenerate pair (Yes/No)? Why or why not? HN CI CH3 ci↑ ∙H -F CH3 -F
Chapter1: Lewis Structures
Section: Chapter Questions
Problem 24EQ
Related questions
Question
Transcribed Image Text:6) This question is concerned with vibrational spectra (Infrared and Raman).
a) How many normal modes of vibration are expected in these molecules? (Show calculations)
i) Theobromine (the caffeine-like stimulant that is found in chocolate)
b) In the molecular vibration shown here for trans-1,4-dichlorocyclohexane, both
chlorine atoms stretch away from the carbon to which they are bonded
(arrows). Will this mode be IR active?
Will this mode be Raman active?
In each case, why or why not?
ii) Cyanopolyyne (an organic molecular wire that has been detected spectroscopically in interstellar space, and
is postulated to be a precursor to biomolecules: HC=C-C=C-C=N
c) Why are CH4 and CO₂ considered greenhouse gases, but O₂ and N₂ are not?
d) Are the vibrations shown here a degenerate pair (Yes/No)?
Why or why not?
HN
CI
CH3
ci↑
∙H
-F
CH3
-F
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