Which N-atom of cyanide species is more basic?

Which is more basic?

Which is more basic

Which N of guanidine (I) is more basic and is more likely to be protonated ?

Which of the following species is most basic and have NO back bonding ?

Which N - atom of guanidine (H_(2)overset(* *)(N)-overset(overset(* *)NH_(2))overset(|)(C)=overset(* *)(N)H) is more basic and why?

Which of the following species is basic and reducing ?