C-13 Signals

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casper22

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I am still struggling to understand the entire chapter on spectroscopy and have decide to concentrate more of practice problems then trying to memorize the topic...

I am sorry for not being able to post the question... it is from DAT destroyer 2010 Question 24.

I understand how structure A has 8 signals but my confusion is for structure B. Referring to its solution, it says Structure B has 10 signals - my confusion is how come f -g and d-e (marked in the solution) will not have the same signal...is it that for the carbon atom to have same signal it has to be symmetrically opposite...

Again sorry for not including the question here... please help...
 
I'd recommend the ACS book for extra help. I didn't get any C13 NMR on practice tests or the real DAT.
 
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