dat bootcamp orgo question

[Tmac111]

1. 28. Which is the best resonance structure for the following molecule?
   
   
   
   
   • A.
     
   • B.
     
   • C.
     
   • D.
     
   • E.
     
   Incorrect
   
   Answer is B

The thing I don't get about this, is the negative charge should be on the most electronegative atom, the oxygen, and the positive charge should be on the least electronegative, the carbon, right? Answer choice B has the positive charge on a electronegative atom? I thought the answer should be C

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[Psalm104:33]

Answer B would be more stable since it doesn't violate the octet rule which is more important than electronegativity.

 

[tooth knockn]

Answer B would be more stable since it doesn't violate the octet rule which is more important than electronegativity.

Does have anything to do with

CARDIO?

 

[Psalm104:33]

what's CARDIO?

 

[tooth knockn]

CARDIO

http://www.masterorganicchemistry.com/2010/09/22/five-key-factors-that-influence-acidity/


I just read it.

I think I was mistaken....

 

[tooth knockn]

Do you have any tips for resonance?

 

[Psalm104:33]

I just know that the octet rule is the most important one and conjugated pi systems count for a more stable molecule and then the electronegativity of the atom.

 

[Psalm104:33]

CARDIO

http://www.masterorganicchemistry.com/2010/09/22/five-key-factors-that-influence-acidity/


I just read it.

I think I was mistaken....

I think this is right because my orgo professor taught us that but I totally forgot it, thanks for reminding me
Btw do you have any tips for QR and RC?? I'm really struggling with these sections

 

[tooth knockn]

RC:

I read quickly through each paragraph, 1 by 1 , and during or after each read paragraph I jot down key words or topic from that particular paragraph.

Give each paragraph a numerical position ex: paragraph 1, paragraph 2, etc.

Qr: do problems sets of 10 take a break and review. And repeat.

 

[Psalm104:33]

RC:

I read quickly through each paragraph, 1 by 1 , and during or after each read paragraph I jot down key words or topic from that particular paragraph.

Give each paragraph a numerical position ex: paragraph 1, paragraph 2, etc.

Qr: do problems sets of 10 take a break and review. And repeat.

Thank you .. I think I'm gonna try the 10 questions for QR.. for RC I tried doing that in a different way but it wasn't great, I'll try it your way though hopefully it works

 

[tooth knockn]

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[Tmac111]

ah okay thanks!

 

[emminent]

1. 28. Which is the best resonance structure for the following molecule?
   
   
   • A.
     
   • B.
     
   • C.
     
   • D.
     
   • E.
     
   Incorrect
   
   Answer is B

The thing I don't get about this, is the negative charge should be on the most electronegative atom, the oxygen, and the positive charge should be on the least electronegative, the carbon, right? Answer choice B has the positive charge on a electronegative atom? I thought the answer should be C

If you have Chad's Videos you should watch those; he explains it very well. I forgot some but this is some simple rules/explanations of mine.

1) you want least amount of charge
2) if there is charges put the negative charge on most electronegative atom (oxygen)
3) try to maintain the octet rule for all atoms

A) Oxygen has negative charge but C has positive charge. C doesn't really want to be positive; better to have it on N
B) C atoms looks good and see explanation for A
C) again C doesn't work well w/ positive charge
D) see above
E) no shifting/rearranging H's