AAMC 8 Question 206

[pandulce321]

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I don't understand the answer. Why isn't it B? Please help 🙁

 

[estairella]

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]

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

 

[estairella]

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.

 

[pandulce321]

It was the alkene question. Thanks!

 

[supafield]

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]

Where does it say we don't need to know alkenes? We had a TPR lecture on it.

 

[ih8mcat]

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.

 

[chaeymaey]

omg, u're right! http://www.aamc.org/students/mcat/studentmanual/biologicalsciences/organicchemistry.pdf

 

[supafield]

omg, u're right! http://www.aamc.org/students/mcat/studentmanual/biologicalsciences/organicchemistry.pdf

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....