Winter 2015 Final #9A [ENDORSED]

[David Sung 2H]

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]

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]

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

[ntruong2H]

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]

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.