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(a)
Interpretation:
The diagram for three different vibrational modes of water is to be drawn.
Concept introduction:
A molecule is made up of atoms that are bonded together by covalent bonds. These bonds have a to and fro movement. Vibrational spectroscopy is observed due to vibration in a molecule. The molecule possessing vibrational spectrum undergoes a change in its dipole moment for a particular mode of vibration.
(b)
Interpretation:
The different vibrations are to be classified as stretching or bending vibrations.
Concept introduction:
A molecule is made up of atoms that are bonded together by covalent bonds. These bonds have a to and fro movement. Vibrational spectroscopy is observed due to vibration in a molecule. The molecule possessing vibrational spectrum undergoes a change in its dipole moment for a particular mode of vibration.
(c)
Interpretation:
The vibrations of water vapor in the IR spectrum are to be classified as stretching or bending vibrations.
Concept introduction:
A molecule is made up of atoms that are bonded together by covalent bonds. These bonds have a to and fro movement. Vibrational spectroscopy is observed due to vibration in a molecule. The molecule possessing vibrational spectrum undergoes a change in its dipole moment for a particular mode of vibration.
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Chapter 12 Solutions
EBK ORGANIC CHEMISTRY
- 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 -Farrow_forwardQ2. 22 (a) Write down the Hamiltonian of a molecule having M nuclei and N electrons with a dear definition for each term. (b) Derive the binding energy for the H2 molecule in terms of Coulomb (J), exchange (K) and overlap (S) integrals using valence bond (VB) theory. Write down the singlet and triplet wavefunctions for an H₂ molecule using VB theory. (c) Draw the MO-diagram for a general diatomic molecule. Show the electronic configuration of F2*, F2 and discuss their bond properties and relative stabilities.arrow_forwardThe infrared spectra of the four isomers of the C5H10O molecule are given below. Match the spectra with the compounds whose structures are given.arrow_forward
- The harmonic oscillator model is a good approximation of atomic stretching. (1) Use an energy level diagram to explain typical vibration absorbance observed in IR spectroscopy.arrow_forward(i) Identify TWO (2) functional groups presence in the molecule and state their frequencies. (ii) Predict the possible chemical structure of molecule based on the IR spectra with chemical formula C7H8.arrow_forwardstate which of the following molecules show a pure rational microwave absorption spectrum and explain why (a) H2O (b) CO2 (c) NH3 (d) N2O (e) Benzene (f) Cl2arrow_forward
- Se(II) has a 3p ground term and a 3d and 3f excited states. (a) how many lines would you expect in the absorption spectrum? (b) how many lines would you expect in our emission spectrum? (c) show the numerical values for all possible S, L, and J This is the only info given, there is no graph.arrow_forwardQ.1: The force constant of the bond in HCl is (516 N/m). Assuming the value of the force constant does not depend on the mass of the atoms in the molecule, calculate the fundamental vibrational frequency of each of the following: 'HCl. 'H'Cl and ?H*Cl. Q.2: The Interatomic Distance in the HCl Molecule The spacing, A(1 /2) between the lines in the rotational spectrum of HCI(g) is 20cm'.Calculate the distance between the nuclei (the length of the bond) in the HCl molecule.arrow_forward9) The vibrational frequency of gaseous HCl occurs at 2885 cm¹ in the IR spectrum. What is the energy E, of this radiation in joules? a) 5.73 x 10-20 J b) 8.24 x 10-19 J c) 6.48 x 10-21 J d) 1.80 x 10-19 Jarrow_forward
- 4G I 5:53 2.30 O Yo 40 52% KB/s 1. The C-C stretch in allene (H,C-C=CH,) is about 1650 cm'; the C-H stretch is about 3,100 cm". Calculate the corresponding wavelengths (in nm) and energies (in kJ/mol) of these vibrations. () IIarrow_forwardWrite the valence-bond wavefunction for the single bond in HCl?arrow_forwardThe properties of a molecule that are most frequently calculated are geometry, energy (compared to that of other isomers), and spectra. Why is it more of a challenge to calculate “simple” properties like melting point and density? Hint: is there a difference between a molecule X and the substance X?arrow_forward
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