allstardentist

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Apr 27, 2006
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Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2

Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2

anyone?
 

DMD to Be

not luffin' this weather.
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Mar 22, 2006
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allstardentist said:
Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2

Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2

anyone?
CH3 and NH2 are activators - meaning they push electrons into the ring. A, B, and C are the only deactivators. I'd probably say Bromine would have the greatest electron-withdrawing effect. Not totally sure about that though.
 

Immuno-guy

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Jun 24, 2006
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Surely it is fluorine.

NH3 and CH3 are electron donating; leaving only halogens. Of these, F is clearly the most electonegative and therefore withdrawing.

Do we agree?
 
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DMD to Be

not luffin' this weather.
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lol, guess i'll be moving my DAT test date back a few weeks... :laugh:
 

dental#1

Fla DDS
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Jul 22, 2006
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allstardentist said:
Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2

Which of the following substituents has the greatest
electron-withdrawing effect?
A. Br
B. Cl
C. F
D. CH3
E. NH2




anyone?

C is 200% correct! F- is much more electronegative therefore giving it the ability to withdraw e- more than the others!(Br an Cl)
:thumbup:
 
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