The document discusses the relative acidities of four compounds X, Y, Z and W. It explains that X is a stronger acid than W because nitrogen's electronegativity induces a greater negative inductive effect in X. It then explains that Y is a stronger acid than X because the carbonyl in Y is attached to N-OH, inducing a greater negative inductive effect than in X. Finally, it explains that Z is the strongest acid because the highlighted proton is attached to oxygen, which is more electronegative than nitrogen and induces a greater negative inductive effect.