Answer
The proton on the right is more acidic.
Work Step by Step
Follow the ARIO order to know which one is more acidic.
1. Atom:
The proton on the left is connected to a carbon.
The proton on the right is connected to a oxygen.
Since both atoms are in the same row, and oxygen is more electronegative, the conjugate base from the proton on the right will be more stable.
** Since this molecule doesn't have triple bonds, we don't need to check the exception we've learned in this section.
Therefore, the proton on the right is more acidic.
