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View Full Version : ochem problems allstardentist 07-26-2006, 07:33 PM 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 07-26-2006, 07:49 PM 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 07-26-2006, 07:52 PM 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? aranjuez 07-26-2006, 07:53 PM Immuno, Agreed. aranjuez allstardentist 07-26-2006, 08:04 PM oops, u guys are right. i was right too. i just looked at the wrong solution. DMD to Be 07-26-2006, 08:12 PM lol, guess i'll be moving my DAT test date back a few weeks... :laugh: dental#1 07-26-2006, 09:11 PM 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: |