Arrange the following in the decreasing order of pK_b values I. C_2H_5NH_2 II. C_6H_5NHCH_3 III. (C_2H_5)_2NH IV. C_6H_5NH_2

MHT CET Chemistry question

Arrange the following in the decreasing order of values I. II. III. IV.

(A)IV > II > I > IIICorrect
(B)IV > II > III > I
(C)I > III > IV > II
(D)I > III > II > IV

Answer: (A)

Solution

A larger means a weaker base; the aromatic amines IV (about 9.4) and II (about 9.2) are far weaker than the aliphatic amines, with IV slightly weaker than II, and among the aliphatic amines diethylamine

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Question ID VK-082531