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Amines

Question
CBSEENCH12009047

Arrange the following:
In decreasing order of the pKb values C2H5NH2, C6H5 NHCH3, (C2H5)2NH and C6H5NH2.

Solution
(C2H5)2NH > C2H5NH2 > C6H5NHCH3 > C6H5NH2.