Answer
The hydrogen on the left is more acidic.
Work Step by Step
If we remove the left proton, the conjugate base will have these changes:
- The Hydrogen on the left will be removed.
- The Oxygen that was connected to the Hydrogen will get a negative charge, because the electrons that were making the bond will turn into a lone pair.
If we remove the proton on the right, the conjugate base will have these changes:
- The Hydrogen on the right will be removed.
- The Nitrogen that was connected to the hydrogen will get a negative charge, because the electrons that were making the bond will turn into a lone pair.
Since Oxygen is more electronegative than Nitrogen, the proton on the left will be more acidic.
** If the atoms are in the same row, the more electronegative one will be more stable with charges.
