Answer:
2-nitrophenol is more acidic than 3-nitrophenol
benyl amine is more basic than aniline
dimethylamine is more basic than triethylamine
Step-by-step explanation
Mesomeric effect stabilizes the anion formed when hydrogen of the the -OH group in the 2-nitrophenol is lost. This mesomerism is most pronounced at the 2 and 4 position.
Stronger bases have more available lone pair of electrons. The lone pair of electrons in aniline is delocalized over the ring. Hence it is unavailable for protonation while the lone pair on benzyl amine is available for protonation
Diethylamine is a stronger base because it has a balance of both inductive electron donation by alkyl groups, and solvation of the conjugate acid unlike triethylamine. Hence Diethylamine is a stronger base than triethylamine