CHEMISTRY
140B
NAME
(please print)
MIDTERM EXAM
FIRST
LAST
A
UG
18, 2008
(C
P
10-13, V&S 5
TH
ED
)
SIGNATURE
ID NUMBER
LAST NAME OF PERSON SEATED TO YOUR RIGHT
:
LAST NAME OF PERSON SEATED TO YOUR LEFT
:
DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO
.
−
Please
sign
your name on the top of pages 1 through 7.
−
Please check that you have 10 pages (including this one; page 10 is blank for your
scratch work).
Page 8 and 9 contain tables of NMR and IR data.
-
Answer only in the space provided.
Do not write answers on the back of a page.
_____________________________________
Question
Points
Score
_____________________________________
1.
70
_____
2.
55
_____
3.
50
_____
4.
25
_____
_____________________________________
Total
200
_____
_____________________________________
H
He
Li Be
B
C
N
O
F
Ne
Na Mg
Al Si P
S
Cl Ar
K
Ca Sc Ti V
Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y
Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I
Xe
Cs Ba La Hf Ta W
Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
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NAME:________________________________
2
1a.
(
36 pts)
On the lines provided, indicate the number of hydrogen and carbon signals
present in the
1
H and
13
C NMR spectra for each molecule shown below (assume all
samples are at room temperature and that a distinct resonance would be observed for
nuclei in different environments):
H
C
H
C
H
C
H
C
O
Me
Me
OH
O
Br
Br
1b.
(20 pts)
On the line provided, indicate the number of triplets expected in the
1
H NMR
spectrum of each molecule. Assume that hydrogens in two different environments will
exhibit different coupling constants to hydrogens in a third environment.
Also assume
that allylic and geminal couplings will be observable.

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- Summer '08
- BURKHART
- Chemistry, Organic chemistry, Nuclear magnetic resonance, Ether, 1H NMR spectrum, Ti V Cr Mn Fe Co Ni Cu Zn Ga Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Ba La Hf, RCH3 Secondary alkyl
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