1.

Arrange the following in order of their pKb value (B) CH3–NH–CH3 (C) H2N–CH=NH (1) A > B > C (2) B > A > C (3) C > B > A (4) B > C > A

Answer»

The answer is (4) B > C > A

Option "A" represent Guanadine type compound while (C) represent the imidine class of compound and (B) represent aliphatic amines. The conjugate acid of Guanadine is most resonance stabilised followed by imidine. Hence A is more basic than C than B.



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