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posted by  confused19 on 8/31/2008 8:30:28 PM  |  status: Live  

PLEASE HELP ASAP....I WILL RATE ASAP..IM SO CONFUSED:( WILL GIVE BONUS

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1)      a) There are at least four Lewis structures for C2H3O- that place a formal charge on only 1 atom. Show them:      

 

 

 

 

 

 

 

 

 

 

b) Two of these from “a” are resonance forms. Which two ?      

 

 

 

2)       The following Lewis structure for C4H5O-  has two other resonance forms:

 

 

 

a)      Draw these other forms:             

 

 

 

 

 

Of the three resonance forms, which do you predict to be the major contributor to C4H5O-, and why?
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posted by Werner on 9/2/2008 7:24:57 AM  |  status: Live
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confused19's comment:
"thank you!!"
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 1.  a)
 
  
 
 
 
 
b)
 
 
 
 
2.a)
 
 
  Among three resonance structures first structure is the major contributer to C4H5O-, because according to the resonance rules negative charge on more electronegative atom is favorable. But in remaining two structures the negative charge present on less electronegative carbon atoms.
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