Winter 2015 Final #9A  [ENDORSED]

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David Sung 2H
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Winter 2015 Final #9A

Postby David Sung 2H » Fri Mar 17, 2017 6:41 pm

For question 9A, why is the correct answer trans (E) when the 4 Carbons and respective hydrogens have a higher atomic number than the Chlorine on the opposite side?

ntruong2H
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Re: Winter 2015 Final #9A

Postby ntruong2H » Sat Mar 18, 2017 1:04 am

David Sung 2H wrote:For question 9A, why is the correct answer trans (E) when the 4 Carbons and respective hydrogens have a higher atomic number than the Chlorine on the opposite side?



you have to do it atom by atom. So compare the the atomic number of Cl to the atomic number of C in the carbon chain. Cl has a higher atomic number. Therefore, it has as higher priority, and it is trans (E)

KelseyKobayashi_2M
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Re: Winter 2015 Final #9A

Postby KelseyKobayashi_2M » Sat Mar 18, 2017 2:29 pm

Also for this question on the other molecule, is the cycloheptane a substituent because of the alcohol?

ntruong2H
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Re: Winter 2015 Final #9A  [ENDORSED]

Postby ntruong2H » Sat Mar 18, 2017 3:08 pm

KelseyKobayashi_2M wrote:Also for this question on the other molecule, is the cycloheptane a substituent because of the alcohol?


Yes. The main chain must always include the functional group since functional groups have the highest priority in naming.

garrett_perozich
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Re: Winter 2015 Final #9A

Postby garrett_perozich » Sat Mar 18, 2017 5:44 pm

Why is the substituent given priority in regards to naming? In other words, why wouldn't it be 3-(3-chlorocycloheptnyl)-2-methylpropan-1-ol? I thought that the functional group always receives the lowest number.


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