The acidity of a thiol proton most closely resembles which of the following acids?

A) phenol
B) ethanol
C) acetic acid
D) ammonia

Which of the following functional groups has the most deshielded proton and would be predicted to show an NMR signal that is the farthest downfield?

A) benzylic - H
B) allylic - H
C) aldehyde - H
D) aromatic - H
E) acetylenic - H

Cyclic esters are called ________.

A) lactones
B) lactams
C) lacrimals
D) imides
E) enamines