Chem2311Chapter9Problems

Chem2311Chapter9Problems - Chemistry
2311
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Unformatted text preview: Chemistry
2311
 Chapter
9
Questions
 Section
I:

Circle
the
number
which
corresponds
to
the
answer
to
each
of
the
following
 questions.

There
is
only
one
correct
answer
for
each
question.
 1 . W h i c h C 4H 9B r c o m p o u n d g i v e s a t r i p l e t a t a p p r o x i m a t e l y 3 . 5 p p m i n t h e 1H N M R s p e c t r u m ? a. 1 b. 2 c. 3 d. 4 
 2 . W h i c h f e a t u r e i n t h e 1H N M R s p e c t r u m p r o v i d e s i n f o r m a t i o n a b o u t t h e e l e c t r o n i c e n v ir o n m e n t o f th e p r o to n s in a c o m p o u n d ? a . n u m b e r o f s ig n a ls b . in te g r a l c . s p littin g d . c h e m ic a l s h ift 3. What is the principle that allows us to use mass spectrometry to determine the molecular weight of a compound? a . h ig h e r m o le c u la r w e ig h t c o m p o u n d s a r e le s s v o la tile b . h ig h e r m o le c u la r w e ig h t c o m p o u n d s a r e m o r e d e n s e c . a b e a m o f h ig h e r m o le c u la r w e ig h t c a tio n s is d e fle c te d le s s b y a m a g n e tic fie ld d . io n s w ith h ig h e r m o le c u la r w e ig h t a b s o r b h ig h e r fr e q u e n c ie s o f lig h t 
 4 . W h i c h o f t h e f o l l o w i n g i s n o t t r u e r e g a r d i n g 1H N M R s p e c t r o s c o p y ? a . a “ d o w n fie ld ” p e a k a p p e a r s a t a lo w e r v a lu e o f δ b . o n a 3 0 0 M H z in s tr u m e n t, a p r o to n th a t a d s o r b s ir r a d ia tio n a t a fr e q u e n c y 9 0 0 H z h ig h e r th a n th e a d s o r p tio n o f T M S a p p e a r s a t δ 3 p p m .
 c . δ fo r a p a r tic u la r p r o to n is in d e p e n d e n t o f th e m a g n e tic fie ld s tr e n g th o f th e in s tr u m e n t u s e d . d . “ d e s h ie ld in g ” le a d s to p e a k s a t h ig h e r v a lu e s o f δ 5 . W h ic h o f th e fo llo w in g is th e d e fin itio n o f th e b a s e p e a k o f a m a s s s p e c tr u m ? a . th e p e a k c o r r e s p o n d in g to th e m o s t a b u n d a n t io n b . th e p e a k c o r r e s p o n d in g to th e io n w ith lo w e s t m /e c . th e p e a k c o r r e s p o n d in g to th e m o le c u la r io n p e a k d .
t h e 
p e a k 
c o r r e s p o n d in g 
t o 
t h e 
io n 
a r is in g 
t o 
lo s s 
o f 
a 
p r o t o n 
f r o m 
t h e 
m o le c u la r 
io n 
 6 . W h i c h C 4H 9B r c o m p o u n d ( s ) g i v e s a 13C N M R s p e c t r u m c o n s i s t i n g o f f o u r s i g n a l s ? a. only 1 b. only 1 and 2 c. only 2 and 3 d. 1, 2, 3 and 4 
 
 
 
 1 0 . . W h i c h C 9H 10O c o m p o u n d g i v e s t h e f o l l o w i n g 1H N M R s p e c t r u m ? a. 1 b. 2 c. 3 d. 4 Section
II.
For
the
following
problems,
draw
the
structure
that
corresponds
to
the
preceding
 spectra. A. C5H10O, MW = 86 












































 
 B. C6H14O, MW = 102 












































 C. C8H14, MW = 110 
 ...
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This note was uploaded on 06/19/2009 for the course CHEM 2311 taught by Professor Tyson during the Fall '07 term at Georgia Tech.

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