specifying wh hchsomeawapwsetcafSaplS ent) u conclude that the bottle cor (para) 1 Ans:A 10.The most downfield proton NMR signal (ie..signal most to the left in the spectrum)in the following molecule would be ACH3Br H;C-C-CH2-C -CH34一 B B)B C)C D)D E) there is no way to tel Page5 Page 5 9. A bottle in a chemical stockroom was labeled simply “dichlorobenzene” without specifying which isomer was present. Capillary GC showed that it was a single pure compound, and the proton decoupled carbon NMR spectrum showed three peaks (not including solvent). You conclude that the bottle contained A) Cl Cl (ortho) B) Cl Cl (para) C) Cl Cl (meta) D) any of the dichlorobenzene isomers E) none of the dichlorobenzene isomers Ans: A 10. The most downfield proton NMR signal (i.e., signal most to the left in the spectrum) in the following molecule would be H3C C CH2 C CH3 Br Br CH3 Br D B C A A) A B) B C) C D) D E) there is no way to tell Ans: C