Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Question
Chapter 5.SE, Problem 69AP
Interpretation Introduction
Interpretation:
The chirality of 4-methylcyclohexylideneacticacid is to be explained.
Concept introduction:
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(a
4 shows scanning electron microscope (SEM) images of extruded
actions of packing bed for two capillary columns of different diameters,
al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the
same stationary phase, spherical particles with 1-um diameter.
A) When the columns were prepared, the figure shows that the column with
the larger diameter has more packing irregularities. Explain this observation.
B) Predict what affect this should have on band broadening and discuss your
prediction using the van Deemter terms.
C) Does this figure support your explanations in application question 33?
Explain why or why not and make any changes in your answers in light of
this figure.
Figure 4 SEM images of
sections of packed columns
for a) 750 and b) 30-um-i.d.
capillary columns.³
fcrip
= ↓ bandwidth Il temp
32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual
components of the van Deemter equation and consequently, band broadening?
Increase temperature
Longer column
Using a gas mobile phase
instead of liquid
Smaller particle stationary phase
Multiple Paths
Diffusion
Mass Transfer
34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.).
A) Predict whether decreasing the column inner diameters increase or decrease bandwidth.
B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or
decreasing bandwidth as a function of i.d. and justify your answer.
Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was
obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles.
35
20
H(um)
큰 20
15
90
0+
1500
100
75
550
01
02
594
05
μ(cm/sec)
30
15
10
Chapter 5 Solutions
Organic Chemistry
Ch. 5.2 - Prob. 1PCh. 5.2 - Prob. 2PCh. 5.2 - Prob. 3PCh. 5.2 - Prob. 4PCh. 5.3 - Is cocaine (Worked Example 5-2) dextrorotatory or...Ch. 5.3 - Prob. 6PCh. 5.5 - Prob. 7PCh. 5.5 - Prob. 8PCh. 5.5 - Prob. 9PCh. 5.5 - Assign R or S configuration to the chirality...
Ch. 5.5 - Draw a tetrahedral representation of...Ch. 5.5 - Prob. 12PCh. 5.6 - One of the following molecules (a)–(d) is...Ch. 5.6 - Prob. 14PCh. 5.6 - Assign R or S configuration to each chirality...Ch. 5.7 - Prob. 16PCh. 5.7 - Which of the following have a meso form? (Recall...Ch. 5.7 - Does the following structure represent a meso...Ch. 5.8 - Prob. 19PCh. 5.8 - Prob. 20PCh. 5.9 - Prob. 21PCh. 5.11 - Prob. 22PCh. 5.11 - Prob. 23PCh. 5.11 - The lactic acid that builds up in tired muscles is...Ch. 5.11 - The aconitase-catalyzed addition of water to...Ch. 5.SE - Which of the following structures are identical?...Ch. 5.SE - Prob. 27VCCh. 5.SE - Prob. 28VCCh. 5.SE - Assign R or S configuration to each chirality...Ch. 5.SE - Prob. 30VCCh. 5.SE - Prob. 31APCh. 5.SE - Which of the following compounds are chiral? Draw...Ch. 5.SE - Prob. 33APCh. 5.SE - Eight alcohols have the formula C5H12O. Draw them....Ch. 5.SE - Draw compounds that fit the following...Ch. 5.SE - Prob. 36APCh. 5.SE - Prob. 37APCh. 5.SE - Prob. 38APCh. 5.SE - What is the stereochemical configuration of the...Ch. 5.SE - Prob. 40APCh. 5.SE - Prob. 41APCh. 5.SE - Prob. 42APCh. 5.SE - Prob. 43APCh. 5.SE - Assign R or S configuration to each chirality...Ch. 5.SE - Assign R or S configuration to each chirality...Ch. 5.SE - Prob. 46APCh. 5.SE - Assign R or S configuration to each chirality...Ch. 5.SE - Assign R or S configurations to the chirality...Ch. 5.SE - Assign R or S stereochemistry to the chirality...Ch. 5.SE - Prob. 50APCh. 5.SE - Draw examples of the following: (a) A meso...Ch. 5.SE - Prob. 52APCh. 5.SE - Prob. 53APCh. 5.SE - Prob. 54APCh. 5.SE - On reaction with hydrogen gas by a platinum...Ch. 5.SE - Prob. 56APCh. 5.SE - Prob. 57APCh. 5.SE - One of the steps in fat metabolism is the...Ch. 5.SE - The dehydration of citrate to yield cis-aconitate,...Ch. 5.SE - The first step in the metabolism of glycerol,...Ch. 5.SE - One of the steps in fatty-acid biosynthesis is the...Ch. 5.SE - Prob. 62APCh. 5.SE - Draw tetrahedral representations of the two...Ch. 5.SE - The naturally occurring form of the amino acid...Ch. 5.SE - Prob. 65APCh. 5.SE - Prob. 66APCh. 5.SE - Prob. 67APCh. 5.SE - Allenes are compounds with adjacent carbon-carbon...Ch. 5.SE - Prob. 69APCh. 5.SE - Prob. 70APCh. 5.SE - How many stereoisomers of...Ch. 5.SE - Draw both cis- and trans-1,4-dimethylcyclohexane...Ch. 5.SE - Draw both cis- and trans-1,3-dimethylcyclohexane...Ch. 5.SE - cis-1,2-Dimethylcyclohexane is optically inactive...Ch. 5.SE - Prob. 75APCh. 5.SE - Prob. 76APCh. 5.SE - Prob. 77AP
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