Topscore orgo question help please

[rocky90]

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Exam 1 question 3 (73) says that there are 2 singlets in answer b. Can anyone please explain. The answer is not helping me.
Thanks

 

[needzmoar]

Exam 1 question 3 (73) says that there are 2 singlets in answer b. Can anyone please explain. The answer is not helping me.
Thanks

Could you take a screen shot?

 

[rocky90]

I dont mind but is it ok to post the question?

 

[Dental2000]

yes post it don worry...No one here is gonna snitch on you...

 

[rmm30]

yes post it don worry...No one here is gonna snitch on you...

They might...there are some real low lives on this forum. I've been cruising it for almost a year and have witnessed at least a half dozen tattletails. Nobody likes tattletails!

 

[glo1984]

Draw it out and reword it as your own question with the purpose of understanding it better, then post the screenshot.

 

[needzmoar]

if you want, give me the name of the structure and I'll generate an HNMR/CNMR for you.

 

[LetsGo2DSchool]

yes post it don worry...No one here is gonna snitch on you...

Snitches are bitches and deserve stitches.

 

[Dusk]

I'm reviving this thread. Help me out please! The answer states that there are two singlets in:

B. 1,4-Dimethoxybenzene

http://en.wikipedia.org/wiki/1,4-Dimethoxybenzene


But wouldn't there also be two singlets in another answer choice:
D. Acetone ?

Wouldn't acetone give 2 singlets as well? Or is it because there's symmetry, so only one H singlet is shown since they overlap? And 1,4 dimethoxybenzene shows two singlets because one from the aromatic H and one from the methoxy H? The other methoxy H and aromatic H's are equivalent so would just overlap, leading to only two visible singlets? Am I correct?

 

[FROGGBUSTER]

Wouldn't acetone give 2 singlets as well? Or is it because there's symmetry, so only one H singlet is shown since they overlap? And 1,4 dimethoxybenzene shows two singlets because one from the aromatic H and one from the methoxy H? The other methoxy H and aromatic H's are equivalent so would just overlap, leading to only two visible singlets? Am I correct?

Yup, acetone should give only one singlet I think. All 6 H's are equivalent.

I think your reasoning is correct for 1,4-dmb as well.

 

[Dusk]

Yup, acetone should give only one singlet I think. All 6 H's are equivalent.

I think your reasoning is correct for 1,4-dmb as well.

thank you thank you!