11.Avery old bottle labeled only"chlorinated benzene"was found in the stockroom. E) Ans:D resent in the proton NMR for ethylpropanoate? unt TMS as A)2 B)3C)4 D)5E)6 Ans:C Page6
Page 6 11. A very old bottle labeled only “chlorinated benzene” was found in the stockroom. Capillary GC showed (surprisingly) that the compound was pure, and a proton-decoupled 13C NMR spectrum showed only two peaks. Which of the following compounds was in the bottle? A) Cl B) Cl Cl C) Cl Cl D) Cl Cl E) Cl Cl Cl Ans: D 12. How many different signals will be present in the proton NMR for ethylpropanoate? (Do not count TMS as one of the signals!) A) 2 B) 3 C) 4 D) 5 E) 6 Ans: C
13.Which compound most likely exhibits the following proton NMR? c) D E) ns.A Page7
Page 7 13. Which compound most likely exhibits the following proton NMR? A) O O B) O O C) H H H O D) O O E) CH2CH3 Ans: A
rs ill ive three sinls (not counting TMS)in the Page8
Page 8 14. Which of the following structures will give three signals (not counting TMS) in the proton decoupled 13C NMR? A) O B) Br Cl C) O O D) O O E) N CH3 Ans: D
15.Which compound most likely matches the following proton NMR? H -OCH3 Ans:E 16乙2aameng,owhorygabnepoondaopeacNMRspecm Ans E C9)3D)4E)5 Page9
Page 9 15. Which compound most likely matches the following proton NMR? A) HO O B) CH3 C) Br D) OH E) C C H H H3C OCH3 Ans: E 16. 2-pentanone would show how many signals in the proton-decoupled 13C NMR spectrum (not counting TMS)? A) 1 B) 2 C) 3 D) 4 E) 5 Ans: E