Although the exam was still pretty tough for me, this series took a BIG edge off of it. Too bad i only found this the night before lol your review problems were nearly identical to the ACS exam and your strategies helped me a ton so thank you and good luck to everyone else!
I know you made these a long time ago, but I just wanted you to know how helpful these truly are. My organic chemistry ACS exam is tomorrow and these are very helpful rerefreshers so that I remember what has happened throughout the entire semester. You also did a better job of explaining some of these concepts over my professor. Much appreciated!!
For question #4 how come the hydrogen that is attached to the same Carbon as Chlorine did get taken up by the OH and leaving it E- behind? with that happening and OH being a base, the Carbons form a double bond kicking of the strong leaving group chlorine. If that is the case the first one on the left should be the answer.
for #6 is it double the concentration of the substrates BECAUSE only half of the recommended solvent was used? what is the relationship between concentration of substrate and the amount of solvent used?
The rate of a reaction is based on the molar concentration of the substrates. (The actual concentrations need to be molar, but in this example, it is easier to think in g/L) If you dissolve 10g of material in 100mL of solvent, then the concentration will be 0.1 g/mL. If you dissolved that same 10g of material into 50mL of solvent instead, then the concentration will be 0.2 g/mL. I hope that helps you see the connection of volume and concentration.
Both the cyclopentyl and difluoro compounds have resonance stabilization with the C=O. The electronegativity of fluorine atoms sucks out the electron density between the O-H and weakens it. Therefore, the difluoro is the stronger acid, which makes it the weaker nucleophile.
Although the exam was still pretty tough for me, this series took a BIG edge off of it. Too bad i only found this the night before lol your review problems were nearly identical to the ACS exam and your strategies helped me a ton so thank you and good luck to everyone else!
I'm glad they helped even for a short time. If you are going to take the MCAT/DAT/etc., let me know if you have any questions or need help.
I know you made these a long time ago, but I just wanted you to know how helpful these truly are. My organic chemistry ACS exam is tomorrow and these are very helpful rerefreshers so that I remember what has happened throughout the entire semester. You also did a better job of explaining some of these concepts over my professor. Much appreciated!!
Thank you. I am glad that you found them useful. Good luck on the exam.
For question #4 how come the hydrogen that is attached to the same Carbon as Chlorine did get taken up by the OH and leaving it E- behind? with that happening and OH being a base, the Carbons form a double bond kicking of the strong leaving group chlorine. If that is the case the first one on the left should be the answer.
Where did you get the numbers from for question 6? How did you get 4 as the answer? how did you use 2x and 2x and the 1/2?
Thank you! Taking the ACS soon and I love using your videos to review!
Thanks. Good luck with the exam. Let me know if you have additional questions or need any help. (nwymer@nccu.edu)
for #6 is it double the concentration of the substrates BECAUSE only half of the recommended solvent was used? what is the relationship between concentration of substrate and the amount of solvent used?
The rate of a reaction is based on the molar concentration of the substrates. (The actual concentrations need to be molar, but in this example, it is easier to think in g/L) If you dissolve 10g of material in 100mL of solvent, then the concentration will be 0.1 g/mL. If you dissolved that same 10g of material into 50mL of solvent instead, then the concentration will be 0.2 g/mL. I hope that helps you see the connection of volume and concentration.
I am confused on #8! Wouldn't the cyclopentyl group have resonance stabilization over the difluoro group thus making it a weaker nuc? Thank you!
Both the cyclopentyl and difluoro compounds have resonance stabilization with the C=O. The electronegativity of fluorine atoms sucks out the electron density between the O-H and weakens it. Therefore, the difluoro is the stronger acid, which makes it the weaker nucleophile.