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Midterm

chem_3351_second_hour_exam_key_fall_2016Exam


Department
Chemistry & Biochemistry
Course Code
CHEM 3351
Professor
All
Study Guide
Midterm

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Easily Legible Printed Name:______________________________
Page 1 of 6
CHEM 3351 (100), Fall 2016
Professor Walba
Second Hour Exam
October 18, 2016
scores:
1) 20
2) 25
3) 25
4) 20
5) 10
PLEASE read the questions very carefully!
PLEASE legibly print your name on each page of the exam.
H
He
Li
Be
B
C
N
O
F
Na
Mg
Al
Si
P
S
Ne
Cl
Ar
Br
I
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
35
53
1A
2A
3A
4A
5A
6A
7A
8A
CU Honor Code Pledge: On my honor, as a University of
Colorado at Boulder Student, I have neither given nor received
unauthorized assistance.
Signature: ______________________________________
Recitation TA Name: _____________________________
Recitation day and time: ___________________________
This is a closed-book exam. The use of notes, calculators, scratch
paper, or cell phones will not be allowed during the exam. You
may use models brought in a clear Ziploc bag. Please put all your
answers on the test in the appropriate place. Use the backs of the
pages for scratch (there are two additional blank scratch sheets
after the last page of the exam). DO NOT PUT ANSWERS ON
THE SCRATCH SHEETS.
Key

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Printed Name:
Page 2 of 6 Total points for this page:
1 (20 pts) a) For each molecule below, carefully give the configuration of each tetrahedral stereocenter using
the R/S stereochemical descriptor system.
b) All of the following pairs of molecules (in each box) are isomers. For each of these pairs of molecules,
describe their relationship using the standard organic pairwise descriptors for isomers (homomers,
enantiomers, diastereomers, constitutional isomers). Put your answers just below the structures in the same
box.
c) Nalfon, a non-steroidal anti-inflammatory drug, has the
structure given at right - not showing stereochemistry.
The active drug has the (S) configuration.
Carefully draw the structure of (S)-Nalfon in the box,
showing stereochemistry. Use the "Wedges and Dashes"
method for showing the stereochemistry, as I did in the
structures in parts a) and b) above.
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