1. Give a brief mechanistic justification of why reaction did not also occur at position 3 to displace the bromo group in an analogous process.
2. Three of the four nitrogens atoms of compound F are basic but the fourth is not protonated, even under very acidic conditions. Identify this non-basic nitrogen and explain why it is unreactive. 
3.  

H. CI NH2 heat E Br F Br 3.