Arrange the following :
(i) In decreasing order of pKb values :
C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2
(ii) In increasing order of basic strength :
(a) Aniline, p-nitroaniline and p-toluidine
(b) C6H5NH2, C6H5NHCH3, C6H5CH2NH2
(iii) In decreasing order of basic strength :
C6H5NH2, C6H5N(CH3)2, (C2H5)2NH, CH3NH2
(iv) Decreasing order of basic strength in gas phase :
C2H5NH2, (C2H5)2NH, (C2H5)3N and NH3
(v) Increasing order of boiling point :
C2H5OH, (CH3)2NH, C2H5NH2
