Hi erevy1,

 

Could some1 tell me what does this sentence means:

 

"which product dominates"?

 

I think it means which product is in excess? what u think?

 

Thnx

usually when i see that phrase it is talking about to simultaneous competeing reactions and wants to know which reaction is favoured.

 

i would need to see the context to be sure as it could conceivable apply to equilibria as well.

well the question was in the reaction between propene and HBr which product will be dominate? ... the the question has not sunk in my head!

 

can u help now...!

ahhh. it wants to know whether 1-bromopropane or 2-bromopropane will be most abundant amoung the products of the reaction.

so that confirms my suggestion that this means which of them is in excess(abundant)?

 

Thnx

yeah. do you know which rule tells you how to figure it out?

Not really no. I think we just have to measure the percentage yeild of each products. Is it?

nope, you can do it entirely theoretically.

 

does Markovnikov's Rule ring a bell?

 

i would advise against going to the wiki page to read about it as it has the exact scenario you are talking about and probably wouldn't lead to you understanding it any better.

Thnx, yes i am aware of Markovnikov's rule and I think it suggested that where to place your halogen atom in the carbon chain? How can it possibly explain which product is abundant? By the way my answer was right though!

 

Thnx again

well, the two possible products are 1-Bromopropane and 2-Bromopropane.

 

both will be formed but one more than the other. Markovnikovs rule tells you exactly which will be produced more often because it tells you where the Bromine is most likely to go.

wow thanks, insane_alien, I really appreciate your explaination. I think it was not 2 hard after all. I haven't revised my syllabus for ages and some1 asked this question but I was unable to understand the question?