1.

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)):}

Answer»

Solution :

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]


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