Q.

The increasing orders of pKb for the following compounds will be:

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a

(B)<(C)<(A)

b

(B)<(A)<(C)

c

(C)<(A)<(B)

d

(A)<(B)<(C)

answer is B.

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Detailed Solution

(B) is guanidine type and hence is the most basic followed by (A) which is an amidine which must be more basic than the simple secondary amine (C) Therefore the order of pKa is B
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