pandulce321

Member
10+ Year Member
5+ Year Member
Jan 11, 2006
378
0
Status
Medical Student
I don't understand the answer. Why isn't it B? Please help :(
 

estairella

Senior Member
10+ Year Member
May 7, 2006
403
1
Status
Pre-Medical
Plus end grows faster than minus end. In answer B, it moves to the left. In answers A and C, the concentration is too low, it depolymerizes (shrinks).

So that's why D is the correct answer.
 

ih8mcat

Dynomite!
10+ Year Member
7+ Year Member
Jul 9, 2006
90
0
Status
Medical Student
trozman said:
Plus end grows faster than minus end. In answer B, it moves to the left. In answers A and C, the concentration is too low, it depolymerizes (shrinks).

So that's why D is the correct answer.
that's question 204, 206 is c because it has something to do with that markovinikov/anti-markovnikov mumbo jumbo which you can follow from the examples they provide for you at the beginning of the passage...I doubt this type of passage is going to show up because we don't have to know alkenes anymore
 
About the Ads

estairella

Senior Member
10+ Year Member
May 7, 2006
403
1
Status
Pre-Medical
ih8mcat said:
that's question 204, 206 is c because it has something to do with that markovinikov/anti-markovnikov mumbo jumbo which you can follow from the examples they provide for you at the beginning of the passage...I doubt this type of passage is going to show up because we don't have to know alkenes anymore
Errm, it's 206 on my file. It depends on whether yours goes from 1-216 (writing samples counted) or 1-214.

In any case, if the OP was referring to THAT question, it's not B) oxymercuration/demercuration because that follows Markovnikov addition... same reason for A). The product is a secondary alcohol.. Markovnikov addition would've yielded a tertiary alcohol.

I think Markovnikov/antiMarkovnikov should still be known, because it's pretty straight forward. BH3 (hydroboration) + hydrogen peroxide or HBr + peroxide = anti (remember peroxide)... all others = Markovnikov.
 
OP
pandulce321

pandulce321

Member
10+ Year Member
5+ Year Member
Jan 11, 2006
378
0
Status
Medical Student
It was the alkene question. Thanks!
 

supafield

Dream Big
10+ Year Member
7+ Year Member
May 18, 2006
676
0
Florida
Status
ih8mcat said:
that's question 204, 206 is c because it has something to do with that markovinikov/anti-markovnikov mumbo jumbo which you can follow from the examples they provide for you at the beginning of the passage...I doubt this type of passage is going to show up because we don't have to know alkenes anymore

We don't have to know alkenes anymore?? TPR has 3 chapters of rxns and the second chapter is all about alkenes.... markovnikov and all that... it's a good portion of the orgo...
 

chaeymaey

1K Member
10+ Year Member
15+ Year Member
May 25, 2003
1,589
2
35
TX
prettydoc.blogspot.com
Status
Fellow [Any Field]
Where does it say we don't need to know alkenes? We had a TPR lecture on it.
 

ih8mcat

Dynomite!
10+ Year Member
7+ Year Member
Jul 9, 2006
90
0
Status
Medical Student
supafield said:
We don't have to know alkenes anymore?? TPR has 3 chapters of rxns and the second chapter is all about alkenes.... markovnikov and all that... it's a good portion of the orgo...

TPR materials are outdated, i'm taking the course this summer as well. When I brought this to the attention of my instructor, he gave me a really bs answer.

http://www.aamc.org/students/mcat/

select biological sciences at the bottom of the page, I think the orgo content that we have to know is at the end of that pdf. Also according to this doc we don't have to know benzene chem either.
 

supafield

Dream Big
10+ Year Member
7+ Year Member
May 18, 2006
676
0
Florida
Status
chaeymaey said:
Well thank you for that post.... I have a big study sheet involving Hydroboration and Oxymercuration.... among other things
I read the listing on the AAMC site and it specifically says no Alkenes
Damn TPR... lol
Does that mean E1, and E2 reactions are toast too? Because they form alkenes...

Better start learning carboxylic acids, aldehydes and ketones a lot better lol....
 
About the Ads