1) with HNO2 sec amine formed R2NH + HNO2------->R2NNO(oily) + H2O bt tert amine does nt gv so it only dissolves.

2)then hinbergs test that must be given in ncert.

3)hofmann mustard oil reaction. thats reaction with carbon disulphide followed by HgCl2 primary gv black ppt of Hgs and sec does nt gv and tert does not show any reaction.