University of Alaska's organic chem professor has his ENTIRE ORGANIC CHEMISTY less plan in this directory style database/site.

Quizes, exams, lectures, everything. I was browsing google for rules on MP vs BP with branching molecules, and found it.

http://www.uaf.edu/chem/green/ ORGANIC CHEM!!!


Enjoy :D

Too bad you didn't post this BEFORE my test. This looks like good practice.

I was looking over this http://www.uaf.edu/chem/green/321E1recentpracticekey.pdf
For Problem 5, shouldn't the C-N-C bond angle be approximately 109.5 since it's trigonal pyramidal (3 bonds and 1 lone pair = tetrahedral ~107).
Also, isn't the hybrid on N sp3 (hence the tetrahedral).

Sweet!!!! :):thumbup::thumbup::thumbup::thumbup:

GO ALASKA!! :meanie:

I'd say it IS sp3 hydridized, hence the four areas of eceltron density.

I'm not too sure about the bond angle though.

yeah the answer key is wrong, the N with lone pair electrons are in SP3 hybridization, however poses a trignal pyramidal shape, so the correct answer should have been ~107

although it is also important to note that things like nitrogen that has lone pair electrons CAN "rehybridize" from SP3 to SP2 due creating a resonance structures with a conjugated systems.

So I got trans-3-ethyl-1-isopropylcyclopentane for #11. It states that its actually trans-1-ethyl-3-isocyclopentane. Why does it give the ethyl numbering priority over the isobutyl group? I thought the size of the group gives it priority...anyone?

IUPAC Rules have it in alphabetical order when dealing with C-C bonding of the same type (single bond in this particular case). That is to say that the lower the letter (where A = 1), the lower the number. Since E comes before P, ethyl is given the higher priority.

IUPAC Rules have it in alphabetical order when dealing with C-C bonding of the same type (single bond in this particular case). That is to say that the lower the letter (where A = 1), the lower the number. Since E comes before P, ethyl is given the higher priority.

Oh I see. Thanks for that, I appreciate it. Well I know that numeral prefixes like di-, tri-, and tetra- aren't involved in the alphabetical ordering. My question is when you name compounds with the prefixes neo-, sec-, and in this case iso-, do they become part of the name and become ordered alphabetically or are they the same as the di-, tri-, tetra- prefixes where they play no part in the ordering the substituent group. I know that was a handful but thanks in advanced!