Rank the following compounds in order of decreasing Brønsted acidity (i.e. most acidic first, least acidic last)

What reagents A and B would be most appropriate for the following synthesis?  

1.png What is 5 pointing to?

16.png What is 2 pointing at?

12.png what is the thick membrane that 2 is pointing at?

4.png What is 2 pointing to?

8.png What is 6?

10.png What is 3 pointing at?

13.png What is 1 pointing to?

10.png What is 5 pointing to?