(a)P-nitroaniline < P-bromo aniline < P-amino benzaldehyde(b)P-nitro aniline > P-amino benzaldehyde < P-bromo aniline(c)P-methyl aniline > P-chloroaniline > P-amino aceto phenone(d)P-amino acetophenone > P-chloroaniline > p-methyl aniline