is more basic than

How many statements are correct of the following compounds I is more basic than IV, III is more basic than IV, III is less basic than IV, I is more basic than II. II is more basic than I and IV, II is more basic than I, III and IV.

The pH of solution is 9 . It is "………" times more basic than a solution with pH = 6

Why is ethyl amine more basic than ammonia ?

How many of the following compounds are more basic than ?