ada 2009 ochem question

[skim1988]

Advertisement - Members don't see this ad

89. how many isomeric mono-substitution products are possible for the bromination of the aromatic hydrocarbon napthalene?

I the answer is 2 but i thought the answer should be 3. I attached an image with arrows pointing to the places that I thought Br can be added onto. Please help me out.

 

[needzmoar]

89. how many isomeric mono-substitution products are possible for the bromination of the aromatic hydrocarbon napthalene?

I the answer is 2 but i thought the answer should be 3. I attached an image with arrows pointing to the places that I thought Br can be added onto. Please help me out.

That's anthracene?

edit: I think you're talking about this problem.

http://206.82.221.135/showthread.php?p=11260709

 

[skim1988]

That's anthracene?

edit: I think you're talking about this problem.

http://206.82.221.135/showthread.php?p=11260709

o i see... they asked for naphthalene but showed a figure of anthracene. Is this a type or are they trying to trick us?

 

[Demps]

naphthalene is two aromatic rings together.

what you drew is anthracene

 

[Demps]

o i see... they asked for naphthalene but showed a figure of anthracene. Is this a type or are they trying to trick us?

I dont have the 2009 ADA exam but I guess it must be a typo

 

[skim1988]

Hey demps what'd you think of the QR section in 2009?

 

[Demps]

Hey demps what'd you think of the QR section in 2009?

I didnt buy so I don't have 2009 ADA test. I can't comment, sorry 🙁

I'm preparing myself with CDM and Math Destroyer. I have topscore and i did two of them so far.

 

[skim1988]

i see i see. for me it was harder than any of topscore or math destroyer...

 

[Demps]

i see i see. for me it was harder than any of topscore or math destroyer...

lol that is not good to hear lol..

I hit 20 and 19 on the first QR for the first two topscore. 2009 ADA must be damn hard

 

[skim1988]

yea it's pretty bad. ill give you an example...

an elliptical mirror has foci at (+1,0), a major axis length of sqrt(20), and a minor axis length 4 units. A beam of light originating from the focus at (-1,0) is reflected of the elliptical mirror once before arriving at the other focus. What is the total length of the path followed by the beam of light?

doesnt it seem like a physic problem? there's like 2 more problems like this... problems i cant even setup.

 

[Demps]

yea it's pretty bad. ill give you an example...

an elliptical mirror has foci at (+1,0), a major axis length of sqrt(20), and a minor axis length 4 units. A beam of light originating from the focus at (-1,0) is reflected of the elliptical mirror once before arriving at the other focus. What is the total length of the path followed by the beam of light?

doesnt it seem like a physic problem? there's like 2 more problems like this... problems i cant even setup.

😱😱

I would just skip and get whatever I can get right and hopefully it will be better than 19~20 lol... I don't know how to set up either haha