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Orgo Lab Exam 2 (Lon Capa Qs + Lecture Material) Questions And Answers With Verified Solutions 100% Correct

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Orgo Lab Exam 2 (Lon Capa Qs + Lecture Material) Questions And Answers With Verified Solutions 100% Correct

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  • January 9, 2025
  • 6
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • orgo lab exam 2 lon capa qs lecture material q
  • which of the following statements about the ordi
  • what is the wavenumber of ir radiation designated
  • which of the following events may occur when ir ra

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Orgo Lab Exam 2 (Lon Capa Qs +
Lecture Material) Questions And
Answers With Verified Solutions 100%
Correct
1. Which of the following statements about the ordinary IR spectroscopic
regions are TRUE?
False: An IR wavelength of 40 microns corresponds to a wavenumber of 25
inverse cm.
False: Ordinarily we sense most IR frequencies as colors in the region we call red.
True: We can sense some of the frequencies of the FUNDAMENTAL region of
the IR as heat.
False: In general, radio frequencies are higher wavenumbers than IR radiation.
True: In general, the IR FUNDAMENTAL region has a longer wavelength than
the region we call the ultraviolet (UV) region.

2. What is the wavenumber of IR radiation designated by 21.19 microns?
Answer:
One micron is 1×10−61 \times 10^{-6}1×10−6 m
One cm is 1×10−21 \times 10^{-2}1×10−2 m
1/21.19=0.04711/21.19 = 0.04711/21.19=0.0471 cm−1^{-1}−1, which becomes
471 when raised to the fourth power.

3. Which of the following events may occur when IR radiation is absorbed?
False: Bonds absorbing IR radiation do so without changing their dipole moment.
False: Bonding electrons are promoted to higher energy molecular orbitals.
False: Chemical bonds are broken.
False: Relative nuclear spins of nuclei with non-zero I₀’s are changed.
True: Intra-molecular bond angles are changed.

4. Wavelength absorption
Alkene: 1640 cm−1^{-1}−1
Alcohol: 3300 cm−1^{-1}−1
Ketones/Aldehydes: 1725 cm−1^{-1}−1
Alkanes: 3000 cm−1^{-1}−1
Ether: 1200 cm−1^{-1}−1
Alkynes: 2200 cm−1^{-1}−1

, 5. Which of the following groups MAY have no detectable IR absorption in
the range usually associated with an absorption?
True: Peroxide O-O bond
False: Hydroxyl OH
False: Ketene C=C=O bonds
True: C triple bond C
False: Aldehyde carbonyl

6. What is the SODAR of a molecule with 10 carbon atoms, 22 hydrogen
atoms, and 3 oxygen atoms?
Answer:
SODAR = (2C+2−H)2\frac{(2C + 2 - H)}{2}2(2C+2−H)
SODAR = 0

7. The relative integrated signal intensities, the number of signals, the peak
multiplicities, and the chemical shifts correspond to:
Answer:
The relative number of nuclei responsible for each peak
The number of chemically non-equivalent nuclei
The number of adjacent, coupled nuclei
The nature of the chemical environment for each different group of nuclei

8. Which of the following statements are TRUE for first-order analyses of
NMR spectra?
True: Equivalent protons do not split each other.
False: The difference in absorption frequency is equal to or less than 6 J.
True: The spin-multiplicity of the proton NMR absorption of the methylene group
in ethanol-OD is 4.
False: First-order multiplets are symmetrical, and their chemical shift is given by
the position of the first peak in the multiplet.
False: Carbon-13, an NMR-active nucleus, has a nuclear spin quantum number of
0.

9. What are the relative intensities of an NMR quintet signal?
Answer: 1:4:6:4:1

10. Upfield vs. Downfield
Answer: The most upfield signal would be furthest from the carboxyl group of an
aldehyde.

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