Amines

I have 3 questions; 1) Place the following amines in order of basicity, starting with the most basic: Ethylamine, Diethylamine, Diethylpropylamine, Phenylamine. I assume the idea is that the most stable amine or the one with highest b.p. will be most basic? In this case phenylamine be most basic? 2) What would you expect to happen if phenylamine reacted with concentrated sulphuric acid and tin, and then reacted with sodium hydroxide? Here nitrobenzene does react with hcl/sn to give the amine anyway idk if its a reversible but why would you further reduce it anyway. 3) Does anyone have a good way of remembering the chain of reactions of making amines from haloalkane + ammonia also chain reactions of making the salts of amines where haloalkane + primary amine. I am struggling with remembering those chain reactions so I guess will forget if I don't get a systematic way to remember so if anyone has answers pls share thanks...