Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Textbook Question
Chapter 19, Problem 19.36QAP
From the proton NMR spectrum in Figure 19-44, deduce the structure of this hydrocarbon
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The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound containing no nitrogen exhibits strong,
broad absorption across the 2500-3300 cm³¹ region, accompanied by 2200 (w) and 1715 (s) cm-¹ bands.
Relative absorption intensity: (s)=strong, (m)=medium, (w)=weak.
What functional class(es) does the compound belong to?
List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly.
Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm³¹.
The functional class(es) of this compound is(are)
. (Enter letters from the table below, in any order, with no spaces or commas.)
a. alkane (List only if no other functional class applies.)
b. alkene
c. terminal alkyne
d. internal alkyne
e. arene
f. alcohol
g. ether
h. amine
i. aldehyde or ketone
j.carboxylic acid
k. ester
I. nitrile
How can you distinguish aldehydes, ketones, and carboxylic acids from each other using IR spectra? Explain using specific examples.
In Section 6.2d, we saw that the pK, of an acid is
equal to the pH of the solution at which half the acid
has dissociated into its conjugate base. UV-vis
spectroscopy can be used to measure the relative
concentrations involved if the acid or conjugate base
absorbs UV-vis light. With this in mind, suppose that
a particular acid has a Amax of 312 nm. The figure
here shows the absorbance at that wavelength as
a function of pH. What is the pk, of the acid?
3
4
6
7
8
10
11
12
pH
Absorbance at 312 nm
Chapter 19 Solutions
Principles of Instrumental Analysis, 6th Edition
Ch. 19 - Prob. 19.1QAPCh. 19 - Prob. 19.2QAPCh. 19 - Prob. 19.3QAPCh. 19 - Prob. 19.4QAPCh. 19 - Prob. 19.5QAPCh. 19 - A nucleus has a spin quantum number of 7/2. How...Ch. 19 - Prob. 19.7QAPCh. 19 - Prob. 19.8QAPCh. 19 - Prob. 19.9QAPCh. 19 - Why is 133C-133C spin-spin splitting not observed...
Ch. 19 - Prob. 19.11QAPCh. 19 - Prob. 19.12QAPCh. 19 - Prob. 19.13QAPCh. 19 - What is a rotating frame of reference?Ch. 19 - How will E for an isolated 13C nucleus compare...Ch. 19 - Prob. 19.16QAPCh. 19 - Prob. 19.17QAPCh. 19 - Prob. 19.18QAPCh. 19 - Prob. 19.19QAPCh. 19 - Prob. 19.20QAPCh. 19 - Prob. 19.21QAPCh. 19 - Prob. 19.22QAPCh. 19 - Prob. 19.23QAPCh. 19 - Prob. 19.24QAPCh. 19 - Prob. 19.25QAPCh. 19 - Prob. 19.26QAPCh. 19 - Prob. 19.27QAPCh. 19 - Prob. 19.28QAPCh. 19 - Prob. 19.29QAPCh. 19 - Prob. 19.30QAPCh. 19 - The proton NMR spectrum in Figure 19.39 is for an...Ch. 19 - The proton NMR spectrum in Figure 19-40 is for a...Ch. 19 - Prob. 19.33QAPCh. 19 - Prob. 19.34QAPCh. 19 - Prob. 19.35QAPCh. 19 - From the proton NMR spectrum in Figure 19-44,...Ch. 19 - From the proton spectrum given in Figure 19-45,...Ch. 19 - Prob. 19.38QAPCh. 19 - Prob. 19.39QAPCh. 19 - Prob. 19.40QAPCh. 19 - Prob. 19.41QAPCh. 19 - Prob. 19.42QAP
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