The Structure of Procaine, Whose Hydrochloride Salt Is the Local

Multiple Choice

The structure of procaine, whose hydrochloride salt is the local anesthetic known as Novocain, is shown below. At physiological pH,

A) only nitrogen 1 will be protonated.
B) only nitrogen 2 will be protonated.
C) both nitrogen 1 and 2 will be protonated.
D) neither nitrogen 1 nor 2 will be protonated.