Pls tell how is R option the most acidic.
@om-vaykul-0 in R, lone pair of N is in conjugation with 2 oxygen. So relatively it has the greatest delta positive charge on itself and hence most polar NH bond. So it will be the most acidic
For comparing Q,P,S
In Q and P there is -M effect which stabilise carbanion formed after removing H+
While no such effect in S
-M of carbonyl in Q is more than -M of benzene ring
Thus the order