Chemistry (Instructor's)
10th Edition
ISBN: 9781305957787
Author: ZUMDAHL
Publisher: CENGAGE L
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Textbook Question
Chapter 9, Problem 45E
Consider the following molecular orbitals formed from the combination of two hydrogen 1s orbitals:
a. Which is the bonding molecular orbital and which is the antibonding molecular orbital? Explain how you can tell by looking at their shapes.
b. Which of the two molecular orbitals is lower in energy? Why is this true?
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Q1: Draw the most stable and the least stable Newman projections about the C2-C3 bond for
each of the following isomers (A-C). Are the barriers to rotation identical for enantiomers A and
B? How about the diastereomers (A versus C or B versus C)?
H Br
H Br
(S) CH3
(R) CH3
H3C (S)
H3C
H Br
Br
H
A
C
enantiomers
H Br
H Br
(R) CH3
H3C (R)
(S) CH3
H3C
H Br
Br H
B
D
identical
2. Histamine (below structure) is a signal molecule involved in immune response and is
a neurotransmitter. Histamine features imidazole ring which is an aromatic heterocycle.
Please answer the following questions regarding Histamine.
b
a
HN
=N
C
NH2
a. Determine hybridization of each N atom (s, p, sp, sp², sp³, etc.) in histamine
N-a hybridization:
N-b hybridization:
N-c hybridization:
b. Determine what atomic orbitals (s, p, sp, sp², sp³, etc.) of the lone pair of each N
atom resided in
N-a hybridization:
N-b hybridization:
N-c hybridization:
Chapter 9 Solutions
Chemistry (Instructor's)
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