Arrange the following in decreasing order of their pK b values

Step-by-step solution

The reaction of amines with mineral acids to form ammonium salts shows that these are basic in nature. Amines have an unshared pair of electrons on nitrogen atom due to which they behave as Lewis base Basic character of amines can be better understood in terms of their K b and pK b , Larger the value of K b or smaller the value of pK b , stronger is the base. The order of basic strength in case of methyl substituted amines and in aqueous solution depends on inductive effect ,steric effect and solvation effect. Henc