Organic Chemistry
6th Edition
ISBN: 9781936221349
Author: Marc Loudon, Jim Parise
Publisher: W. H. Freeman
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 12, Problem 12.6P
Interpretation Introduction
Interpretation:
The peak corresponding to the stretching frequency of
Concept introduction:
Wavelength is the distance between the two crests or troughs of the wave. It is denoted by the symbol
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Q 1(a)
Methane, CH4 is a tetrahedral molecule and does not exhibit a permanent dipole
moment (i.e. it has a dipole moment of 0). Nonetheless, in microwave spectroscopy
methane does exhibit a weak, but measurable absorbance. Explain why you think this
is the case?
Q 1(b)
The diatomic molecule 12C32S has been detected in interstellar gas clouds by
microwave spectroscopy. The masses of the two atoms are C = 12.00 amu and S=
31.972 amu and 12C32S has an equilibrium bond length of 1.534 Å.
Predict which rotational transition in 12C32S will have the greatest population at a
temperature of 85 K.
4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band?
7. Consider the C=O stretching data for the following cyclic ketones: cyclopropane 1813 cm³¹; cyclobutanone
1791 cm³¹; cyclopentanone 1740 cm³¹.
(a) which ketone has the strongest bond?
(b) where in the trend would you expect the C=O stretch of cyclopropenone? (Use the hybridization information
in the same way we used hybridization for C-H stretching.)
Chapter 12 Solutions
Organic Chemistry
Ch. 12 - Prob. 12.1PCh. 12 - Prob. 12.2PCh. 12 - Prob. 12.3PCh. 12 - Prob. 12.4PCh. 12 - Prob. 12.5PCh. 12 - Prob. 12.6PCh. 12 - Prob. 12.7PCh. 12 - Prob. 12.8PCh. 12 - Prob. 12.9PCh. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - Prob. 12.13PCh. 12 - Prob. 12.14PCh. 12 - Prob. 12.15PCh. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - Prob. 12.18PCh. 12 - Prob. 12.19PCh. 12 - Prob. 12.20PCh. 12 - Prob. 12.21PCh. 12 - Prob. 12.22PCh. 12 - Prob. 12.23APCh. 12 - Prob. 12.24APCh. 12 - Prob. 12.25APCh. 12 - Prob. 12.26APCh. 12 - Prob. 12.27APCh. 12 - Prob. 12.28APCh. 12 - Prob. 12.29APCh. 12 - Prob. 12.30APCh. 12 - Prob. 12.31APCh. 12 - Prob. 12.32APCh. 12 - Prob. 12.33APCh. 12 - Prob. 12.34APCh. 12 - Prob. 12.35APCh. 12 - Prob. 12.36APCh. 12 - Prob. 12.37APCh. 12 - Prob. 12.38APCh. 12 - Prob. 12.39APCh. 12 - Prob. 12.40APCh. 12 - Prob. 12.41APCh. 12 - Prob. 12.42APCh. 12 - Prob. 12.43APCh. 12 - Prob. 12.44AP
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- 3. Identify C-Cl stretching peaks in CDC13 and CHC13 spectra. Do these peaks have exactly the same frequencies for both compounds? Explain your answer. 4. Is the C==O stretching frequency the same for acetone and deuterated acetone? Explain your answer. 5. Identify C==O overtone in acetone spectrum which corresponds to the transition from ground level, n=0, to the second excited level, n=2.arrow_forwardA student has acquired an IR spectra of an unknown six-carbon molecule and has determined that it is either 2-hexyne, 1- hexyne, or 1-hexene. How can the student use their knowledge of IR spectroscopy to determine the identity of the molecule? In your answer, clearly specify what regions of the IR spectrum the student should look at and what bonds are responsible for the absorption bands you indicate.arrow_forwardWhy do aldehydes, esters, and amides all have a strong absorption in the 1630-1780 cm1 region of their IR spectra? A) The bond between H and the sp³-hybridized C in these functional groups vibrates in this energy range. B) Each of these functional groups has at least two resonance structures, and the different vibrations of the resonance structures give off energy in this region. C) The bond between O and the sp²-hybridized C in these functional groups vibrates at a frequency in this energy range. D) Light at this wavenumber causes the average C to O bond length to increase which causes more of this light to be transmitted. E) An electron in the bond of these functional groups gets excited to the * orbital.arrow_forward
- A typical 1"B – 'H bond has a stretching frequency of 2400 cm1. Based on your understanding of isotopic effects on vibrational frequencies, and their connection to bond strength, rank the B - H bonds from weakest to strongest. Consider the most common isotopes of the B- H bonds highlighted below. Make sure to explain your ranking. 10В — 1н, 10В — ?н, 11в — 1Н, 11В - нarrow_forwardHow do the following factors affect absorption frequencies? O-H vs O-D. CH stretch, hybrid orbitals used by carbonarrow_forwardThe infrared absorption spectrum of 12C14N has its strongest band at 2500 cm-1 wavenumber. Calculate the force constant (N/m) of the bond in this molecule.arrow_forward
- The beer-lambert law is A = εlc, where A is the absorbance, ε is the molar extinction coefficient, l is the path lengh in cm and C is the concentration. The beer lambert law can be expressed in the form of y=mx + b, where A is y, and C is x.What is b and how is it used to calculate the final absorbance?arrow_forwardWhich of the following molecules would be expected to have absorbance in the IR range from a symmetric stretching vibration? SO2 CS2 CF4 CO2 CH4arrow_forwardWhat IR frequencies would enable a chemist to distinguish between these molecules? CH;CH2OH and CH;CH2OCH;CH3 and CH, HCHCHCCIICH CH, d 3000-3100 cm-1 (=C-H)| 1620-1680 cm-1 (C=C) 3200-3400 cm-1 (OH) || 3000-3100 cm-1 (=C-H)arrow_forward
- The IR spectra of nonane (C,H20) and 1-hexanol (C,H13OH) are shown below. Assign each spectrum to the correct compound and identify the frequencies and the functional groups used to support your assignment. λ (μη) 6 7 8 9 10 11 12 1314 15 2.5 100 3 5 20 4 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬') A (µm) 2.5 100 8 9 10 11 12 13 14 15 3 4 5 7 20 90 80 70 60 50 40 30 20 10 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 400 Frequency (cm¬!) (%) Transmission (%) Transmissionarrow_forward• Calculate the frequency in Hertz, the wavenumber (in cm4), the energy in Joules, and the energy in KJ/mol associated with the 3.517-um vibrational absorption band of an aliphatic ketone. 1000 Tarrow_forward2. Describe some of the vibrational mode at stretching and bending associated with Infrared Spectroscopy. Draw representative structure denoting such vibrational modes.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:Cengage Learning
IR Spectroscopy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=_TmevMf-Zgs;License: Standard YouTube License, CC-BY