Q.

Which one has the smallest  pkb value

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a

(CH3)2NH

b

CH3NH2

c

(CH3)3N

d

C6H5NH2

answer is A.

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Detailed Solution

Greater the basic strength less is the Pkb  value. (CH3)2NH is more basic. Hence its Pkb  value is least.The order of basic nature of Amines is(CH3)2NH > CH3NH2 > (CH3)3N > NH3> C6H5NH2
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