SS08%20140B%20midterm%20exam - CHEMISTRY 140B NAME(please...

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

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.