The decreasing order of basicity of nitrogen in the following compounds is :
(a) `CH_(3)-CH_(2)-NH_(2),C_(6)H_(5)-NH_(2),H_(2)C=CH-NH_(2)`
(b) `(C_(6)H_(5))_(3)N,(C_(6)H_(5))_(2)NH,C_(6)H_(5)NH_(2)`
(c) `H_(2)C=NH,HCN,CH_(3)NH_(2)`
(d) `C_(6)H_(5)NH_(2),C_(6)H_(11)NH_(2),C_(6)H_(5)CONH_(2)`
(e) `C_(5)H_(5)N,C_(4)H_(4)NH,C_(6)H_(5)NH_(2),CH_(3)CONH_(2)`
(f) `C_(6)H_(5)N(CH_(3))_(2),C_(6)H_(3)(CH_(3))_(2)N(CH_(3))_(2),C_(6)H_(5)NH_(2)`
(g) `H_(2)N-C_(6)H_(4)-OCH_(3),C_(6)H_(5)NH_(2),`
`H_(2)N-C_(6)H_(4)-NO_(2),H_(2)N-C_(6)H_(4)-CH_(2)`,
`H_(2)N-C_(6)H_(4)-Cl`
(h) `{:(C_(6)H_(5)-underset("NH")underset("|| ")"C "-NH_(2)", "O_(2)N-C_(6)H_(4)-underset("NH")underset("|| ")"C "-NH_(2)),(Cl-C_(6)H_(4)-underset("NH")underset("|| ")"C "-NH_(2)", "H_(2)N-C_(6)H_(4)-underset("NH")underset("|| ")"C "-NH_(2)):}`

Explanation

Higher the percentage of s-character, the more tightly lone pair is held, and the weaker the base.

Ganidine is strongly basic
Basicity of different nitrogen containing compounds is :
[Guanidine gt aliphatic amines gt `NH_(3)` gt aromatic amines gt amides gt cyanide]