(1) Amines are organic derivativesof ammonia, in whichone, two, or all three of thehydrogens of ammonia are replacedby organic groups. Allaliphatic primary amines arestronger bases thanammonia.In aqueous solution,the pKb’s (basicity) of ammonia,methyl amine, dimethylamine,and trimethyl amineare therefore, respectively,4.74, 3.34, 3.27. and 4.19. Interms of pKb, the strongestbases have the least positivevalues of pKb. So in aqueoussolutions, the strongest basesare: Dimethylamine > methylamine>trimethylamine.>ammonia(asked in IIT JEE Exam).