Chemistry
12th Edition
ISBN: 9780078021510
Author: Raymond Chang Dr., Kenneth Goldsby Professor
Publisher: McGraw-Hill Education
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Chapter 25, Problem 25.52IME
Assume the energy of hydrogen bonds per base pair to be 10 kJ/mol. Given two complementary strands of DNA containing 10 base pairs each, estimate the ratio of two separate strands to hydrogen-bonded double helix in solution at 300 K. The ratio for a single base pair is given by the formula exp(−ΔE/RT), where ΔE is the energy of hydrogen bond per base pair, R is the gas constant, and T is the temperature in kelvins.
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10.
Stereochemistry. Assign R/S stereochemistry for the chiral center indicated on the
following compound. In order to recieve full credit, you MUST SHOW YOUR WORK!
H₂N
CI
OH
CI
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11. () Stereochemistry. Draw all possible stereoisomers of the following compound. Assign
R/S configurations for all stereoisomers and indicate the relationship between each as
enantiomer, diastereomer, or meso.
NH2
H
HNH,
-18
b)
8.
Indicate whether the following carbocation rearrangements are likely to occur
Please explain your rational using 10 words or less
not likely to occur
• The double bond is still in the
Same position
+
Likely
to oc
occur
WHY?
-3
H3C
Brave
Chair Conformers. Draw the chair conformer of the following substituted
cyclohexane. Peform a RING FLIP and indicate the most stable
conformation and briefly explain why using 20 words or less.
CI
2
-cobs ??
MUST INDICATE H -2
-2
Br
EQ
Cl
OR
AT
Br
H&
most stable
WHY?
- 4
CH
12
Conformational Analysis. Draw all 6 conformers (one above each letter) of the
compound below looking down the indicated bond. Write the letter of the
conformer with the HIGHEST and LOWEST in energies on the lines provided.
NOTE: Conformer A MUST be the specific conformer of the structure as drawn below
-4 NOT
HOH
OH
3
Conformer A:
Br
OH
A
Samo
Br H
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Br
H
H3
CH₂
H
anti
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Br CH
clipsed
H
Brott
H
IV
H
MISSING 2
-2
B
C
D
E
F
X
6
Conformer with HIGHEST ENERGY:
13. (1
structure
LOWEST ENERGY:
Nomenclature. a) Give the systematic (IUPAC) name structure. b) Draw the
corresponding to this name. HINT: Do not forget to indicate stereochemistry
when applicable.
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b) (3R,4S)-3-chloro-4-ethyl-2,7-dimethyloctane
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Chapter 25 Solutions
Chemistry
Ch. 25 - Prob. 25.1QPCh. 25 - Prob. 25.2QPCh. 25 - Prob. 25.3QPCh. 25 - Prob. 25.4QPCh. 25 - Prob. 25.5QPCh. 25 - Prob. 25.6QPCh. 25 - Prob. 25.7QPCh. 25 - Prob. 25.8QPCh. 25 - Prob. 25.9QPCh. 25 - Prob. 25.10QP
Ch. 25 - Prob. 25.11QPCh. 25 - Prob. 25.12QPCh. 25 - Prob. 25.13QPCh. 25 - Prob. 25.14QPCh. 25 - Prob. 25.15QPCh. 25 - Prob. 25.16QPCh. 25 - Prob. 25.17QPCh. 25 - Prob. 25.18QPCh. 25 - Prob. 25.19QPCh. 25 - Prob. 25.20QPCh. 25 - Prob. 25.21QPCh. 25 - Prob. 25.22QPCh. 25 - Prob. 25.23QPCh. 25 - Prob. 25.24QPCh. 25 - Prob. 25.25QPCh. 25 - Prob. 25.26QPCh. 25 - Discuss the importance of hydrogen bonding in...Ch. 25 - Proteins vary widely in structure, whereas nucleic...Ch. 25 - Prob. 25.29QPCh. 25 - Prob. 25.30QPCh. 25 - Prob. 25.31QPCh. 25 - Prob. 25.32QPCh. 25 - Prob. 25.33QPCh. 25 - Prob. 25.34QPCh. 25 - Prob. 25.35QPCh. 25 - Chemical analysis shows that hemoglobin contains...Ch. 25 - Prob. 25.37QPCh. 25 - What kind of intermolecular forces are responsible...Ch. 25 - Draw structures of the nucleotides containing the...Ch. 25 - Prob. 25.40QPCh. 25 - Prob. 25.41QPCh. 25 - Prob. 25.42QPCh. 25 - Prob. 25.43QPCh. 25 - Prob. 25.44QPCh. 25 - When deoxyhemoglobin crystals are exposed to...Ch. 25 - Prob. 25.46QPCh. 25 - Prob. 25.47QPCh. 25 - Prob. 25.48QPCh. 25 - Prob. 25.49QPCh. 25 - Prob. 25.50QPCh. 25 - Prob. 25.51QPCh. 25 - Assume the energy of hydrogen bonds per base pair...Ch. 25 - Prob. 25.53IME
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